Question: show the process pls 4. (1 mark) (a) Write down the product rule: (b) Use it to find the derivative of f(x) = costcosr (c)

show the process pls

4. (1 mark) (a) Write down the product rule: (b) Use it to find the derivative of f(x) = costcosr (c) Use it to find the derivative of f(x) = cosr tanr
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