y() = e sin(8) for this one i got 8e^(theta)*cos(8theta)... but it was wrong, what did i do wrong??
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You have neglected the fact that there is a product of functions. If f(x) = g(x)*h(x), then f'(x) = g(x)*h'(x) + g'(x)*h(x). Ringing any bells?
Originally Posted by TKHunny You have neglected the fact that there is a product of functions. If f(x) = g(x)*h(x), then f'(x) = g(x)*h'(x) + g'(x)*h(x). Ringing any bells? can you do it for me so i can see...
Hello, mathaction! Have you forgotten the Product Rule? We have: .
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