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شائع علم المثلثات >

cos(2x-180)-sin(x-90)=0

الحلّ

cos (2 x - 18 0^{\circ}) - sin (x - 9 0^{\circ}) = 0

الحلّ

x = \frac{72 0 ^{\circ} n}{3}, x = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3}

راديان

x = 0 + \frac{4 π}{3} n, x = \frac{2 π}{3} + \frac{4 π}{3} n

خطوات الحلّ

cos (2 x - 18 0^{\circ}) - sin (x - 9 0^{\circ}) = 0

Rewrite using trig identities

cos (2 x - 18 0^{\circ}) - sin (x - 9 0^{\circ}) = 0

Rewrite using trig identities

sin (x - 9 0^{\circ})

sin (s - t) = sin (s) cos (t) - cos (s) sin (t)

:فعّل متطابقة الطرح لزوايا

= sin (x) cos (9 0^{\circ}) - cos (x) sin (9 0^{\circ})

sin (x) cos (9 0^{\circ}) - cos (x) sin (9 0^{\circ})

بسّط:

- cos (x)

sin (x) cos (9 0^{\circ}) - cos (x) sin (9 0^{\circ})

sin (x) cos (9 0^{\circ}) = 0

sin (x) cos (9 0^{\circ})

cos (9 0^{\circ})

بسّط:

0

cos (9 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

cos (9 0^{\circ}) = 0

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= 0

= 0 \cdot sin (x)

0 \cdot a = 0

فعّل القانون

= 0

cos (x) sin (9 0^{\circ}) = cos (x)

cos (x) sin (9 0^{\circ})

sin (9 0^{\circ})

بسّط:

1

sin (9 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

sin (9 0^{\circ}) = 1

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= 1

= 1 \cdot cos (x)

cos (x) \cdot 1 = cos (x) :

اضرب

= cos (x)

= 0 - cos (x)

0 - cos (x) = - cos (x)

= - cos (x)

= - cos (x)

cos (s - t) = cos (s) cos (t) + sin (s) sin (t)

:فعّل متطابقة الطرح لزوايا

= cos (2 x) cos (18 0^{\circ}) + sin (2 x) sin (18 0^{\circ})

cos (2 x) cos (18 0^{\circ}) + sin (2 x) sin (18 0^{\circ})

بسّط:

- cos (2 x)

cos (2 x) cos (18 0^{\circ}) + sin (2 x) sin (18 0^{\circ})

cos (2 x) cos (18 0^{\circ}) = - cos (2 x)

cos (2 x) cos (18 0^{\circ})

cos (18 0^{\circ})

بسّط:

- 1

cos (18 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

cos (18 0^{\circ}) = (- 1)

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= - 1

= (- 1) cos (2 x)

بسّط

= - cos (2 x)

= - cos (2 x) + sin (18 0^{\circ}) sin (2 x)

sin (2 x) sin (18 0^{\circ}) = 0

sin (2 x) sin (18 0^{\circ})

sin (18 0^{\circ})

بسّط:

0

sin (18 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

sin (18 0^{\circ}) = 0

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= 0

= 0 \cdot sin (2 x)

0 \cdot a = 0

فعّل القانون

= 0

= - cos (2 x) + 0

- cos (2 x) + 0 = - cos (2 x)

= - cos (2 x)

= - cos (2 x)

- cos (2 x) - (- cos (x)) = 0

- cos (2 x) - (- cos (x))

بسّط:

- cos (2 x) + cos (x)

- cos (2 x) - (- cos (x))

- (- a) = a

فعّل القانون

= - cos (2 x) + cos (x)

- cos (2 x) + cos (x) = 0

cos (s) - cos (t) = - 2 sin (\frac{s + t}{2}) sin (\frac{s - t}{2})

Eq u a t i o n 0 :

متطابقة تحويل الجمع لضرب

= - 2 sin (\frac{x + 2 x}{2}) sin (\frac{x - 2 x}{2})

- 2 sin (\frac{x + 2 x}{2}) sin (\frac{x - 2 x}{2})

بسّط:

2 sin (\frac{x}{2}) sin (\frac{3 x}{2})

- 2 sin (\frac{x + 2 x}{2}) sin (\frac{x - 2 x}{2})

x + 2 x = 3 x :

اجمع العناصر المتشابهة

= - 2 sin (\frac{3 x}{2}) sin (\frac{x - 2 x}{2})

\frac{x - 2 x}{2} = - \frac{x}{2}

\frac{x - 2 x}{2}

x - 2 x = - x :

اجمع العناصر المتشابهة

= \frac{- x}{2}

\frac{- a}{b} = - \frac{a}{b}

: استخدم ميزات الكسور التالية

= - \frac{x}{2}

= - 2 sin (\frac{3 x}{2}) sin (- \frac{x}{2})

sin (- x) = - sin (x)

:Use the negative angle identity

= - 2 (- sin (\frac{x}{2})) sin (\frac{3 x}{2})

- (- a) = a

فعّل القانون

= 2 sin (\frac{x}{2}) sin (\frac{3 x}{2})

= 2 sin (\frac{x}{2}) sin (\frac{3 x}{2})

2 sin (\frac{3 x}{2}) sin (\frac{x}{2}) = 0

حلّ كل جزء على حدة

sin (\frac{3 x}{2}) = 0 or sin (\frac{x}{2}) = 0

sin (\frac{3 x}{2}) = 0 : x = \frac{72 0 ^{\circ} n}{3}, x = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3}

sin (\frac{3 x}{2}) = 0

sin (\frac{3 x}{2}) = 0 :

حلول عامّة لـ

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

\frac{3 x}{2} = 0 + 36 0^{\circ} n, \frac{3 x}{2} = 18 0^{\circ} + 36 0^{\circ} n

\frac{3 x}{2} = 0 + 36 0^{\circ} n, \frac{3 x}{2} = 18 0^{\circ} + 36 0^{\circ} n

\frac{3 x}{2} = 0 + 36 0^{\circ} n

حلّ:

x = \frac{72 0 ^{\circ} n}{3}

\frac{3 x}{2} = 0 + 36 0^{\circ} n

0 + 36 0^{\circ} n = 36 0^{\circ} n

\frac{3 x}{2} = 36 0^{\circ} n

2

اضرب الطرفين بـ

\frac{3 x}{2} = 36 0^{\circ} n

2

اضرب الطرفين بـ

\frac{2 \cdot 3 x}{2} = 2 \cdot 36 0^{\circ} n

بسّط

3 x = 72 0^{\circ} n

3 x = 72 0^{\circ} n

3

اقسم الطرفين على

3 x = 72 0^{\circ} n

3

اقسم الطرفين على

\frac{3 x}{3} = \frac{72 0 ^{\circ} n}{3}

بسّط

x = \frac{72 0 ^{\circ} n}{3}

x = \frac{72 0 ^{\circ} n}{3}

\frac{3 x}{2} = 18 0^{\circ} + 36 0^{\circ} n

حلّ:

x = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3}

\frac{3 x}{2} = 18 0^{\circ} + 36 0^{\circ} n

2

اضرب الطرفين بـ

\frac{3 x}{2} = 18 0^{\circ} + 36 0^{\circ} n

2

اضرب الطرفين بـ

\frac{2 \cdot 3 x}{2} = 36 0^{\circ} + 2 \cdot 36 0^{\circ} n

بسّط

3 x = 36 0^{\circ} + 72 0^{\circ} n

3 x = 36 0^{\circ} + 72 0^{\circ} n

3

اقسم الطرفين على

3 x = 36 0^{\circ} + 72 0^{\circ} n

3

اقسم الطرفين على

\frac{3 x}{3} = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3}

بسّط

x = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3}

x = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3}

x = \frac{72 0 ^{\circ} n}{3}, x = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3}

sin (\frac{x}{2}) = 0 : x = 72 0^{\circ} n, x = 36 0^{\circ} + 72 0^{\circ} n

sin (\frac{x}{2}) = 0

sin (\frac{x}{2}) = 0 :

حلول عامّة لـ

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

\frac{x}{2} = 0 + 36 0^{\circ} n, \frac{x}{2} = 18 0^{\circ} + 36 0^{\circ} n

\frac{x}{2} = 0 + 36 0^{\circ} n, \frac{x}{2} = 18 0^{\circ} + 36 0^{\circ} n

\frac{x}{2} = 0 + 36 0^{\circ} n

حلّ:

x = 72 0^{\circ} n

\frac{x}{2} = 0 + 36 0^{\circ} n

0 + 36 0^{\circ} n = 36 0^{\circ} n

\frac{x}{2} = 36 0^{\circ} n

2

اضرب الطرفين بـ

\frac{x}{2} = 36 0^{\circ} n

2

اضرب الطرفين بـ

\frac{2 x}{2} = 2 \cdot 36 0^{\circ} n

بسّط

x = 72 0^{\circ} n

x = 72 0^{\circ} n

\frac{x}{2} = 18 0^{\circ} + 36 0^{\circ} n

حلّ:

x = 36 0^{\circ} + 72 0^{\circ} n

\frac{x}{2} = 18 0^{\circ} + 36 0^{\circ} n

2

اضرب الطرفين بـ

\frac{x}{2} = 18 0^{\circ} + 36 0^{\circ} n

2

اضرب الطرفين بـ

\frac{2 x}{2} = 36 0^{\circ} + 2 \cdot 36 0^{\circ} n

بسّط

x = 36 0^{\circ} + 72 0^{\circ} n

x = 36 0^{\circ} + 72 0^{\circ} n

x = 72 0^{\circ} n, x = 36 0^{\circ} + 72 0^{\circ} n

وحّد الحلول

x = \frac{72 0 ^{\circ} n}{3}, x = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3}, x = 72 0^{\circ} n, x = 36 0^{\circ} + 72 0^{\circ} n

ادمج المجالات المتطابقة

x = \frac{72 0 ^{\circ} n}{3}, x = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3}

رسم

أمثلة شائعة

sin(x)tan(x)=0

sin (x) tan (x) = 0

sin(2x)-sin(4x)=0

sin (2 x) - sin (4 x) = 0

cos^2(θ)-cos(θ)-30=0

cos^{2} (θ) - cos (θ) - 30 = 0

2csc(2x)+1=0

2 csc (2 x) + 1 = 0

4sin^2(x)+4sin(x)+1=0

4 sin^{2} (x) + 4 sin (x) + 1 = 0