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

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Solution for cos^2(3x)-sin^2(3x)=-1 equation: 


Simplifying
cos2(3x) + -1sin2(3x) = -1

Remove parenthesis around (3x)
cos2 * 3x + -1sin2(3x) = -1

Reorder the terms for easier multiplication:
3cos2 * x + -1sin2(3x) = -1

Multiply cos2 * x
3cos2x + -1sin2(3x) = -1

Remove parenthesis around (3x)
3cos2x + -1in2s * 3x = -1

Reorder the terms for easier multiplication:
3cos2x + -1 * 3in2s * x = -1

Multiply -1 * 3
3cos2x + -3in2s * x = -1

Multiply in2s * x
3cos2x + -3in2sx = -1

Solving
3cos2x + -3in2sx = -1

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Add '3in2sx' to each side of the equation.
3cos2x + -3in2sx + 3in2sx = -1 + 3in2sx

Combine like terms: -3in2sx + 3in2sx = 0
3cos2x + 0 = -1 + 3in2sx
3cos2x = -1 + 3in2sx

Divide each side by '3os2x'.
c = -0.3333333333o-1s-2x-1 + in2o-1s-1

Simplifying
c = -0.3333333333o-1s-2x-1 + in2o-1s-1

Reorder the terms:
c = in2o-1s-1 + -0.3333333333o-1s-2x-1

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