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If f(x)={asinpi/2(x+1), ,xlt=0(tanx-sinx...

If `f(x)={asinpi/2(x+1), ,xlt=0(tanx-sinx)/(x^3),x >0` is continuous at `x=0` , then a equal `1/2` (b) `1/3` (c) `1/4` (d) `1/6`

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