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If f(x) is a differentiable function for...

If `f(x)` is a differentiable function for all `x in R` such that `f(x)` has fundamental period 2.` f(x)=0` has exactly two solutions in `[0,2],` also `f(0)!=0` lf minimum number of zeros of `h(x) = f' (x) cos x-f(x)sin x` in `(0,99)` is `120 +k,` then k is ......

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