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If f(x)={(sina x^2)/(x^2); x!=0 3/4+1/(...

If `f(x)={(sina x^2)/(x^2); x!=0 3/4+1/(4a); x=0,` is continuous everywhere, then `a=1` (b) `a=-1` `a=(-1)/4` (d) `a=1/4`

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