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Let f(x) b a function for all x in R and...

Let `f(x)` b a function for all `x in R` and f(0)=1. Then `g(x)=f(x)-sqrt((1-cos2x)/2)` at x=0 a) is differentiable at x=0 and its value is 1 b) is differentiable at x=0 and its value is 0 c) is non differentiable at x=0 and its graph has a sharp turn at x =0 d) is non differentiabe at x =0 and its graph has vertical tangent at x =0

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