What is the general solution for 3tan^2(x+15)-1=0 ?

The general solution for 3tan^2(x+15)-1=0 is x=180n+15,x=180n-45

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3tan^2(x+15)-1=0

Solution

3 tan^{2} (x + 1 5^{\circ}) - 1 = 0

Solution

x = 18 0^{\circ} n + 1 5^{\circ}, x = 18 0^{\circ} n - 4 5^{\circ}

Radians

x = \frac{π}{12} + πn, x = - \frac{π}{4} + πn

Solution steps

3 tan^{2} (x + 1 5^{\circ}) - 1 = 0

Solve by substitution

3 tan^{2} (x + 1 5^{\circ}) - 1 = 0

Let:

tan (x + 1 5^{\circ}) = u

3 u^{2} - 1 = 0

3 u^{2} - 1 = 0 : u = \frac{1}{3}, u = - \frac{1}{3}

3 u^{2} - 1 = 0

Move

1

to the right side

3 u^{2} - 1 = 0

Add

1

to both sides

3 u^{2} - 1 + 1 = 0 + 1

Simplify

3 u^{2} = 1

3 u^{2} = 1

Divide both sides by

3

3 u^{2} = 1

Divide both sides by

3

\frac{3 u ^{2}}{3} = \frac{1}{3}

Simplify

u^{2} = \frac{1}{3}

u^{2} = \frac{1}{3}

For

x^{2} = f (a)

the solutions are

x = f (a), - f (a)

u = \frac{1}{3}, u = - \frac{1}{3}

Substitute back

u = tan (x + 1 5^{\circ})

tan (x + 1 5^{\circ}) = \frac{1}{3}, tan (x + 1 5^{\circ}) = - \frac{1}{3}

tan (x + 1 5^{\circ}) = \frac{1}{3}, tan (x + 1 5^{\circ}) = - \frac{1}{3}

tan (x + 1 5^{\circ}) = \frac{1}{3} : x = 18 0^{\circ} n + 1 5^{\circ}

tan (x + 1 5^{\circ}) = \frac{1}{3}

Apply trig inverse properties

tan (x + 1 5^{\circ}) = \frac{1}{3}

General solutions for

tan (x + 1 5^{\circ}) = \frac{1}{3}

tan (x) = a \Rightarrow x = arctan (a) + 18 0^{\circ} n

x + 1 5^{\circ} = arctan (\frac{1}{3}) + 18 0^{\circ} n

x + 1 5^{\circ} = arctan (\frac{1}{3}) + 18 0^{\circ} n

Solve

x + 1 5^{\circ} = arctan (\frac{1}{3}) + 18 0^{\circ} n : x = 18 0^{\circ} n + 1 5^{\circ}

x + 1 5^{\circ} = arctan (\frac{1}{3}) + 18 0^{\circ} n

Simplify

arctan (\frac{1}{3}) + 18 0^{\circ} n : 3 0^{\circ} + 18 0^{\circ} n

arctan (\frac{1}{3}) + 18 0^{\circ} n

Use the following trivial identity:

arctan (\frac{1}{3}) = 3 0^{\circ}

x 0 \frac{3}{3} 13 arctan (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} arctan (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ}

= 3 0^{\circ} + 18 0^{\circ} n

x + 1 5^{\circ} = 3 0^{\circ} + 18 0^{\circ} n

Move

1 5^{\circ}

to the right side

x + 1 5^{\circ} = 3 0^{\circ} + 18 0^{\circ} n

Subtract

1 5^{\circ}

from both sides

x + 1 5^{\circ} - 1 5^{\circ} = 3 0^{\circ} + 18 0^{\circ} n - 1 5^{\circ}

Simplify

x + 1 5^{\circ} - 1 5^{\circ} = 3 0^{\circ} + 18 0^{\circ} n - 1 5^{\circ}

Simplify

x + 1 5^{\circ} - 1 5^{\circ} : x

x + 1 5^{\circ} - 1 5^{\circ}

Add similar elements:

1 5^{\circ} - 1 5^{\circ} = 0

= x

Simplify

3 0^{\circ} + 18 0^{\circ} n - 1 5^{\circ} : 18 0^{\circ} n + 1 5^{\circ}

3 0^{\circ} + 18 0^{\circ} n - 1 5^{\circ}

Group like terms

= 18 0^{\circ} n + 3 0^{\circ} - 1 5^{\circ}

Least Common Multiplier of

6, 12 : 12

6, 12

Least Common Multiplier (LCM)

Prime factorization of

6 : 2 \cdot 3

6

6

divides by

26 = 3 \cdot 2

= 2 \cdot 3

2, 3

are all prime numbers, therefore no further factorization is possible

= 2 \cdot 3

Prime factorization of

12 : 2 \cdot 2 \cdot 3

12

12

divides by

212 = 6 \cdot 2

= 2 \cdot 6

6

divides by

26 = 3 \cdot 2

= 2 \cdot 2 \cdot 3

2, 3

are all prime numbers, therefore no further factorization is possible

= 2 \cdot 2 \cdot 3

Multiply each factor the greatest number of times it occurs in either

6

12

= 2 \cdot 2 \cdot 3

Multiply the numbers:

2 \cdot 2 \cdot 3 = 12

= 12

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

12

For

3 0^{\circ} :

multiply the denominator and numerator by

2

3 0^{\circ} = \frac{18 0 ^{\circ} 2}{6 \cdot 2} = 3 0^{\circ}

= 3 0^{\circ} - 1 5^{\circ}

Since the denominators are equal, combine the fractions:

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

= \frac{18 0 ^{\circ} 2 - 18 0 ^{\circ}}{12}

Add similar elements:

36 0^{\circ} - 18 0^{\circ} = 18 0^{\circ}

= 18 0^{\circ} n + 1 5^{\circ}

x = 18 0^{\circ} n + 1 5^{\circ}

x = 18 0^{\circ} n + 1 5^{\circ}

x = 18 0^{\circ} n + 1 5^{\circ}

x = 18 0^{\circ} n + 1 5^{\circ}

tan (x + 1 5^{\circ}) = - \frac{1}{3} : x = 18 0^{\circ} n - 4 5^{\circ}

tan (x + 1 5^{\circ}) = - \frac{1}{3}

Apply trig inverse properties

tan (x + 1 5^{\circ}) = - \frac{1}{3}

General solutions for

tan (x + 1 5^{\circ}) = - \frac{1}{3}

tan (x) = - a \Rightarrow x = arctan (- a) + 18 0^{\circ} n

x + 1 5^{\circ} = arctan (- \frac{1}{3}) + 18 0^{\circ} n

x + 1 5^{\circ} = arctan (- \frac{1}{3}) + 18 0^{\circ} n

Solve

x + 1 5^{\circ} = arctan (- \frac{1}{3}) + 18 0^{\circ} n : x = 18 0^{\circ} n - 4 5^{\circ}

x + 1 5^{\circ} = arctan (- \frac{1}{3}) + 18 0^{\circ} n

Simplify

arctan (- \frac{1}{3}) + 18 0^{\circ} n : - 3 0^{\circ} + 18 0^{\circ} n

arctan (- \frac{1}{3}) + 18 0^{\circ} n

arctan (- \frac{1}{3}) = - 3 0^{\circ}

arctan (- \frac{1}{3})

Use the following property:

arctan (- x) = - arctan (x)

arctan (- \frac{1}{3}) = - arctan (\frac{1}{3})

= - arctan (\frac{1}{3})

Use the following trivial identity:

arctan (\frac{1}{3}) = 3 0^{\circ}

arctan (\frac{1}{3})

x 0 \frac{3}{3} 13 arctan (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} arctan (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ}

= 3 0^{\circ}

= - 3 0^{\circ}

= - 3 0^{\circ} + 18 0^{\circ} n

x + 1 5^{\circ} = - 3 0^{\circ} + 18 0^{\circ} n

Move

1 5^{\circ}

to the right side

x + 1 5^{\circ} = - 3 0^{\circ} + 18 0^{\circ} n

Subtract

1 5^{\circ}

from both sides

x + 1 5^{\circ} - 1 5^{\circ} = - 3 0^{\circ} + 18 0^{\circ} n - 1 5^{\circ}

Simplify

x + 1 5^{\circ} - 1 5^{\circ} = - 3 0^{\circ} + 18 0^{\circ} n - 1 5^{\circ}

Simplify

x + 1 5^{\circ} - 1 5^{\circ} : x

x + 1 5^{\circ} - 1 5^{\circ}

Add similar elements:

1 5^{\circ} - 1 5^{\circ} = 0

= x

Simplify

- 3 0^{\circ} + 18 0^{\circ} n - 1 5^{\circ} : 18 0^{\circ} n - 4 5^{\circ}

- 3 0^{\circ} + 18 0^{\circ} n - 1 5^{\circ}

Group like terms

= 18 0^{\circ} n - 3 0^{\circ} - 1 5^{\circ}

Least Common Multiplier of

6, 12 : 12

6, 12

Least Common Multiplier (LCM)

Prime factorization of

6 : 2 \cdot 3

6

6

divides by

26 = 3 \cdot 2

= 2 \cdot 3

2, 3

are all prime numbers, therefore no further factorization is possible

= 2 \cdot 3

Prime factorization of

12 : 2 \cdot 2 \cdot 3

12

12

divides by

212 = 6 \cdot 2

= 2 \cdot 6

6

divides by

26 = 3 \cdot 2

= 2 \cdot 2 \cdot 3

2, 3

are all prime numbers, therefore no further factorization is possible

= 2 \cdot 2 \cdot 3

Multiply each factor the greatest number of times it occurs in either

6

12

= 2 \cdot 2 \cdot 3

Multiply the numbers:

2 \cdot 2 \cdot 3 = 12

= 12

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

12

For

3 0^{\circ} :

multiply the denominator and numerator by

2

3 0^{\circ} = \frac{18 0 ^{\circ} 2}{6 \cdot 2} = 3 0^{\circ}

= - 3 0^{\circ} - 1 5^{\circ}

Since the denominators are equal, combine the fractions:

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

= \frac{- 18 0 ^{\circ} 2 - 18 0 ^{\circ}}{12}

Add similar elements:

- 36 0^{\circ} - 18 0^{\circ} = - 54 0^{\circ}

= \frac{- 54 0 ^{\circ}}{12}

Apply the fraction rule:

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

= - 4 5^{\circ}

Cancel the common factor:

3

= 18 0^{\circ} n - 4 5^{\circ}

x = 18 0^{\circ} n - 4 5^{\circ}

x = 18 0^{\circ} n - 4 5^{\circ}

x = 18 0^{\circ} n - 4 5^{\circ}

x = 18 0^{\circ} n - 4 5^{\circ}

Combine all the solutions

x = 18 0^{\circ} n + 1 5^{\circ}, x = 18 0^{\circ} n - 4 5^{\circ}

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Frequently Asked Questions (FAQ)

What is the general solution for 3tan^2(x+15)-1=0 ?
The general solution for 3tan^2(x+15)-1=0 is x=180n+15,x=180n-45