Question: a. Given that f(x) = cos x, show that b. Hence prove that f'(x) = sin x. hosh-1) 1 cosx. h f'(x) = lim sin

a. Given that f(x) = cos x, show that hosh-1) 1 cosx. h f'(x) = lim sin h h sin x

b. Hence prove that f'(x) = −sin x. 

hosh-1) 1 cosx. h f'(x) = lim sin h h sin x

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