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Home  >>  CBSE XI  >>  Math  >>  Limits and Derivatives
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Find the derivative of the following functions ( it is to be understood that a, b, c, d, p, q, r and s are fixed non-zero constants and m and n are integers ) $\large\frac{x}{\sin^nx}$

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Let $f(x) = \large\frac{x}{\sin^nx}$
By quotient rule,
$f'(x) =\large\frac{\sin^nx \large\frac{d}{dx}x-x\large\frac{d}{dx}\sin^nx}{\sin^{2n}x}$
It can be easily shown that $ \large\frac{d}{dx}$$\sin^nx=n \sin^{n-1}x \cos x$
Therefore,
$f'(x) =\large\frac{\sin^nx \large\frac{d}{dx}x-x\large\frac{d}{dx}\sin^nx}{\sin^{2n}x}$
$= \large\frac{\sin^nx.1-x(n \sin^{n-1}x \cos x)}{\sin^{2n}x}$
$ = \large\frac{\sin^{n-1}x(\sin x-nx\cos x)}{\sin^{2n}x}$
$ = \large\frac{\sin x-nx \cos x}{\sin^{n+1}x}$
answered Apr 16, 2014 by thanvigandhi_1
 

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