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Let f(x)=x^2a n dg(x)=sinx for all x in ...

Let `f(x)=x^2a n dg(x)=sinx` for all `x` in `R` Then the set of all `x` satisfying `(fogogof)(x)=(gogof)(x),w h e r e(fog)(x)=f(g(x)),` is

A

(a) `pm sqrt(npi), n in {0,1,2,...}`

B

(b) `pm sqrt(npi), n in {1,2,...}`

C

(c) `pi//2+2npi, n in {...,-2,-1,0,1,2,...}`

D

(d) `2npi, n in {...,-2,-1,0,1,2,...}`

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A
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