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f(x)={(a^x-1)/(x^nsinx)((bsinx-sinb x)/(...

`f(x)={(a^x-1)/(x^nsinx)((bsinx-sinb x)/(cosx-cosb x))^n x >0 and (a^xsinb x-b^xsina x)/(t a n b x-tana x)x<0` is continuous at `x = 0 (a, b > 0, b !=1,a !=b)`. obtain `f(0)` and a relation between `a, b and n`.

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