Posted by Tom on Sunday, June 17, 2012 at 1:32pm.
What do you want to do with the equation?
Do you need to differentiate the right-hand-side?
Treat it as a product of cos(3x) and sin³(x) and within each, use the chain rule.
dy/dx=-3sin(3x)sin³(x)+cos(3x)*3cos²(x)
and simplify.
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