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a) f(\pi)=cos\pi

f(\pi)=-1


b) (g \circ f)(\pi)=g(-1)

g(-1)=2(-1)^2-2

(g \circ f)(\pi)=0


c) (g \circ f)(x)=2(cosx)^2-2

(g \circ f)(x)=cosx^2-1

k=-1

Explanations

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