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Which of the following limits tends to u...

Which of the following limits tends to unity? `(a) ("lim")_(xvec0)sin(tanx)/(sinx)` (b) `("lim")_(xvecpi/2)sin(cosx)/(cosx)` (c) `("lim")_(xvec0)"sin"(e^x-1)/x` (d) `("lim")_(xvec0)(sqrt(1+x)-sqrt(1-x))/x`

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