What is the general solution for sin^2(3a)=0.56 ?

The general solution for sin^2(3a)=0.56 is

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sin^2(3a)=0.56

Solution

sin^{2} (3 a) = 0.56

Solution

a = \frac{0.84554 \dots}{3} + \frac{2 πn}{3}, a = \frac{π}{3} - \frac{0.84554 \dots}{3} + \frac{2 πn}{3}, a = - \frac{0.84554 \dots}{3} + \frac{2 πn}{3}, a = \frac{π}{3} + \frac{0.84554 \dots}{3} + \frac{2 πn}{3}

Degrees

a = 16.14868 \dots^{\circ} + 12 0^{\circ} n, a = 43.85131 \dots^{\circ} + 12 0^{\circ} n, a = - 16.14868 \dots^{\circ} + 12 0^{\circ} n, a = 76.14868 \dots^{\circ} + 12 0^{\circ} n

Solution steps

sin^{2} (3 a) = 0.56

Solve by substitution

sin^{2} (3 a) = 0.56

Let:

sin (3 a) = u

u^{2} = 0.56

u^{2} = 0.56 : u = 0.56, u = - 0.56

u^{2} = 0.56

For

x^{2} = f (a)

the solutions are

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

u = 0.56, u = - 0.56

Substitute back

u = sin (3 a)

sin (3 a) = 0.56, sin (3 a) = - 0.56

sin (3 a) = 0.56, sin (3 a) = - 0.56

sin (3 a) = 0.56 : a = \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}, a = \frac{π}{3} - \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

sin (3 a) = 0.56

Apply trig inverse properties

sin (3 a) = 0.56

General solutions for

sin (3 a) = 0.56

sin (x) = a \Rightarrow x = arcsin (a) + 2 πn, x = π - arcsin (a) + 2 πn

3 a = arcsin (0.56) + 2 πn, 3 a = π - arcsin (0.56) + 2 πn

3 a = arcsin (0.56) + 2 πn, 3 a = π - arcsin (0.56) + 2 πn

Solve

3 a = arcsin (0.56) + 2 πn : a = \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

3 a = arcsin (0.56) + 2 πn

Divide both sides by

3

3 a = arcsin (0.56) + 2 πn

Divide both sides by

3

\frac{3 a}{3} = \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

Simplify

a = \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

a = \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

Solve

3 a = π - arcsin (0.56) + 2 πn : a = \frac{π}{3} - \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

3 a = π - arcsin (0.56) + 2 πn

Divide both sides by

3

3 a = π - arcsin (0.56) + 2 πn

Divide both sides by

3

\frac{3 a}{3} = \frac{π}{3} - \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

Simplify

a = \frac{π}{3} - \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

a = \frac{π}{3} - \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

a = \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}, a = \frac{π}{3} - \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

sin (3 a) = - 0.56 : a = - \frac{arcsin ( \frac{14}{5} )}{3} + \frac{2 πn}{3}, a = \frac{π}{3} + \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

sin (3 a) = - 0.56

Apply trig inverse properties

sin (3 a) = - 0.56

General solutions for

sin (3 a) = - 0.56

sin (x) = - a \Rightarrow x = arcsin (- a) + 2 πn, x = π + arcsin (a) + 2 πn

3 a = arcsin (- 0.56) + 2 πn, 3 a = π + arcsin (0.56) + 2 πn

3 a = arcsin (- 0.56) + 2 πn, 3 a = π + arcsin (0.56) + 2 πn

Solve

3 a = arcsin (- 0.56) + 2 πn : a = - \frac{arcsin ( \frac{14}{5} )}{3} + \frac{2 πn}{3}

3 a = arcsin (- 0.56) + 2 πn

Simplify

arcsin (- 0.56) + 2 πn : - arcsin (\frac{14}{5}) + 2 πn

arcsin (- 0.56) + 2 πn

arcsin (- 0.56) = - arcsin (\frac{14}{5})

arcsin (- 0.56)

= arcsin (- \frac{14}{25})

Use the following property:

arcsin (- x) = - arcsin (x)

arcsin (- \frac{14}{25}) = - arcsin (\frac{14}{25})

= - arcsin (\frac{14}{25})

= - arcsin (\frac{14}{5})

= - arcsin (\frac{14}{5}) + 2 πn

3 a = - arcsin (\frac{14}{5}) + 2 πn

Divide both sides by

3

3 a = - arcsin (\frac{14}{5}) + 2 πn

Divide both sides by

3

\frac{3 a}{3} = - \frac{arcsin ( \frac{14}{5} )}{3} + \frac{2 πn}{3}

Simplify

a = - \frac{arcsin ( \frac{14}{5} )}{3} + \frac{2 πn}{3}

a = - \frac{arcsin ( \frac{14}{5} )}{3} + \frac{2 πn}{3}

Solve

3 a = π + arcsin (0.56) + 2 πn : a = \frac{π}{3} + \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

3 a = π + arcsin (0.56) + 2 πn

Divide both sides by

3

3 a = π + arcsin (0.56) + 2 πn

Divide both sides by

3

\frac{3 a}{3} = \frac{π}{3} + \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

Simplify

a = \frac{π}{3} + \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

a = \frac{π}{3} + \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

a = - \frac{arcsin ( \frac{14}{5} )}{3} + \frac{2 πn}{3}, a = \frac{π}{3} + \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

Combine all the solutions

a = \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}, a = \frac{π}{3} - \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}, a = - \frac{arcsin ( \frac{14}{5} )}{3} + \frac{2 πn}{3}, a = \frac{π}{3} + \frac{arcsin ( 0.56 )}{3} + \frac{2 πn}{3}

Show solutions in decimal form

a = \frac{0.84554 \dots}{3} + \frac{2 πn}{3}, a = \frac{π}{3} - \frac{0.84554 \dots}{3} + \frac{2 πn}{3}, a = - \frac{0.84554 \dots}{3} + \frac{2 πn}{3}, a = \frac{π}{3} + \frac{0.84554 \dots}{3} + \frac{2 πn}{3}

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Frequently Asked Questions (FAQ)

What is the general solution for sin^2(3a)=0.56 ?
The general solution for sin^2(3a)=0.56 is