How do I find the derivative of #f(x) = sin(2x)cos(2x)#?
Personally I prefer the latter option:
I would use the double angle formula:
Trasforming you equation into:
Which can then be differentiated using the chain rule:
Multiply by the derivative of the bracket and differentiate the trig term:
If you want to know the other method, search the 'product rule' in your search engine of choice.