Find the first derivative of the function h(x) = cos^5(3x). which I believe can be rewritten as h (x) = (cos 3x)^5

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`(cos^5(3x))'=5cos^4(3x)*(cos(3x))'=`

`5cos^4(3x)*(-sin(3x))*3=`

`-15cos^4(3x)sin(3x)`

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Find the first derivative of the function h(x) = cos^5(3x). which I believe can be rewritten as h (x) = (cos 3x)^5

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