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人気のある三角関数 >

sin(10)=2sin(a)cos(a)

解

sin (1 0^{\circ}) = 2 sin (a) cos (a)

解

a = 5^{\circ} + 18 0^{\circ} n, a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

+1

ラジアン

a = \frac{π}{36} + πn, a = \frac{π}{2} - \frac{π}{36} + πn

解答ステップ

sin (1 0^{\circ}) = 2 sin (a) cos (a)

両辺から

2 sin (a) cos (a)

を引く

sin (1 0^{\circ}) - 2 sin (a) cos (a) = 0

三角関数の公式を使用して書き換える

sin (1 0^{\circ}) - 2 sin (a) cos (a)

2倍角の公式を使用:

2 sin (x) cos (x) = sin (2 x)

= sin (1 0^{\circ}) - sin (2 a)

sin (1 0^{\circ}) - sin (2 a) = 0

sin (1 0^{\circ})

を右側に移動します

sin (1 0^{\circ}) - sin (2 a) = 0

両辺から

sin (1 0^{\circ})

を引く

sin (1 0^{\circ}) - sin (2 a) - sin (1 0^{\circ}) = 0 - sin (1 0^{\circ})

簡素化

- sin (2 a) = - sin (1 0^{\circ})

- sin (2 a) = - sin (1 0^{\circ})

以下で両辺を割る

- 1

- sin (2 a) = - sin (1 0^{\circ})

以下で両辺を割る

- 1

\frac{- sin ( 2 a )}{- 1} = \frac{- sin ( 1 0 ^{\circ} )}{- 1}

簡素化

\frac{- sin ( 2 a )}{- 1} = \frac{- sin ( 1 0 ^{\circ} )}{- 1}

簡素化

\frac{- sin ( 2 a )}{- 1} : sin (2 a)

\frac{- sin ( 2 a )}{- 1}

分数の規則を適用する:

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

= \frac{sin ( 2 a )}{1}

規則を適用

\frac{a}{1} = a

= sin (2 a)

簡素化

\frac{- sin ( 1 0 ^{\circ} )}{- 1} : sin (1 0^{\circ})

\frac{- sin ( 1 0 ^{\circ} )}{- 1}

分数の規則を適用する:

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

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

分数の規則を適用する:

\frac{a}{1} = a

= sin (1 0^{\circ})

sin (2 a) = sin (1 0^{\circ})

sin (2 a) = sin (1 0^{\circ})

sin (2 a) = sin (1 0^{\circ})

三角関数の逆数プロパティを適用する

sin (2 a) = sin (1 0^{\circ})

以下の一般解

sin (2 a) = sin (1 0^{\circ})

sin (x) = a \Rightarrow x = arcsin (a) + 36 0^{\circ} n, x = 18 0^{\circ} - arcsin (a) + 36 0^{\circ} n

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n, 2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n, 2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

解く

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n : a = 5^{\circ} + 18 0^{\circ} n

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

以下で両辺を割る

2

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

以下で両辺を割る

2

\frac{2 a}{2} = \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

簡素化

\frac{2 a}{2} = \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

簡素化

\frac{2 a}{2} : a

\frac{2 a}{2}

数を割る:

\frac{2}{2} = 1

= a

簡素化

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2} : 5^{\circ} + 18 0^{\circ} n

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} = 5^{\circ}

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2}

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

arcsin (sin (1 0^{\circ}))

- 9 0^{\circ} \leq a \leq 9 0^{\circ}

向けに

, a rcs in (s in (x)) = x

- 9 0^{\circ} \leq 1 0^{\circ} \leq 9 0^{\circ}

= 1 0^{\circ}

= \frac{1 0 ^{\circ}}{2}

分数の規則を適用する:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{18 0 ^{\circ}}{18 \cdot 2}

数を乗じる:

18 \cdot 2 = 36

= 5^{\circ}

= 5^{\circ} + \frac{36 0 ^{\circ} n}{2}

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

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

数を割る:

\frac{2}{2} = 1

= 18 0^{\circ} n

= 5^{\circ} + 18 0^{\circ} n

a = 5^{\circ} + 18 0^{\circ} n

a = 5^{\circ} + 18 0^{\circ} n

a = 5^{\circ} + 18 0^{\circ} n

解く

2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n : a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

以下で両辺を割る

2

2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

以下で両辺を割る

2

\frac{2 a}{2} = 9 0^{\circ} - \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

簡素化

\frac{2 a}{2} = 9 0^{\circ} - \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

簡素化

\frac{2 a}{2} : a

\frac{2 a}{2}

数を割る:

\frac{2}{2} = 1

= a

簡素化

9 0^{\circ} - \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2} : 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

9 0^{\circ} - \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} = 5^{\circ}

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2}

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

arcsin (sin (1 0^{\circ}))

- 9 0^{\circ} \leq a \leq 9 0^{\circ}

向けに

, a rcs in (s in (x)) = x

- 9 0^{\circ} \leq 1 0^{\circ} \leq 9 0^{\circ}

= 1 0^{\circ}

= \frac{1 0 ^{\circ}}{2}

分数の規則を適用する:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{18 0 ^{\circ}}{18 \cdot 2}

数を乗じる:

18 \cdot 2 = 36

= 5^{\circ}

= 9 0^{\circ} - 5^{\circ} + \frac{36 0 ^{\circ} n}{2}

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

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

数を割る:

\frac{2}{2} = 1

= 18 0^{\circ} n

= 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

a = 5^{\circ} + 18 0^{\circ} n, a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

グラフ

人気の例

cos^2(x)=2+2sin(x),0<= x<= 2pi

cos^{2} (x) = 2 + 2 sin (x), 0 \leq x \leq 2 π

cos^{2} (x) = \frac{3}{5}

1-sec^2(x)=tan^2(x)

1 - sec^{2} (x) = tan^{2} (x)

csc^2(x)=(1/(cos(x)))^2

csc^{2} (x) = (\frac{1}{cos ( x )})^{2}

-2cos^2(x)+3cos(x)=1

- 2 cos^{2} (x) + 3 cos (x) = 1