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Let f(x)=sin^2(x/2) +cos^2(x/2) and g(x...

Let `f(x)=sin^2(x/2) +cos^2(x/2)` and `g(x)=sec^2 x- tan^2 x`. The two functions are equal over the set (A) `phi` (B) `R` (C) `R-{0}` (D) 1

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