Answer
(b) $1, x^{7} $
(a) $\pi, \cos x$
Work Step by Step
(b) $x^{7}=f(x)$ , $1=a$
This is because: $1=1^{7}$
(a) $\cos x=f(x)$ , $\pi=a$
This is because: $-1=\cos \pi$
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