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If ("lim")(xrarr0)({(a-n)n x-tanx}sinn...

If `("lim")_(xrarr0)({(a-n)n x-tanx}sinn x)/(x^2)=0,` where `n` is nonzero real number, the `a` is 0 (b) `(n+1)/n` (c) `n` (d) `n+1/n`

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