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Question

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):

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Solution

Consider the function,

f( x )= 1+ 1 x 1 1 x = x+1 x x1 x = x+1 x1

The quotient rule of derivative to find the derivative of the function is,

d dx ( U V )= ( U V V U ) V 2

Where U and V are the derivative of their respective functions.

Apply quotient rule of derivative in the given function,

f ( x )= ( x1 ) d dx ( x+1 )( x+1 ) d dx ( x1 ) ( x1 ) 2 = ( x1 )( 1 )( x+1 )( 1 ) ( x1 ) 2 = x1x1 ( x1 ) 2 = 2 ( x1 ) 2

Thus, the derivative of 1+ 1 x 1 1 x is 2 ( x1 ) 2 .


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