y=-3cos(3x)

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Solution for y=-3cos(3x) equation: 


Simplifying
y = -3cos(3x)

Remove parenthesis around (3x)
y = -3cos * 3x

Reorder the terms for easier multiplication:
y = -3 * 3cos * x

Multiply -3 * 3
y = -9cos * x

Multiply cos * x
y = -9cosx

Solving
y = -9cosx

Solving for variable 'y'.

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

Simplifying
y = -9cosx

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