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If f(x)={(1-cos(1-cos x/2))/(2^m x^n)1x=...

If `f(x)={(1-cos(1-cos x/2))/(2^m x^n)1x=0,x!=0` and `f(0)=1` is continuous at `x=0` then the value of `m+n` is a. 2 b. 3 c. -3 d. 7

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