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यदि ` y= cot ^(-1) ((1- x )/(1+x)) ` तब `(dy)/(dx) ` का मान ज्ञात कीजिए| |
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Answer» `y= cot ^(-1) ((1-x )/(1+x))` माना ` " "x= tan theta ` ` y= cot ^(_1) ((1-tan theta )/(1+tan theta )) =cot ^(-1) ""{tan ((pi )/(4) -theta )}` ` " "= cot ^(-1) [ cot {(pi)/(2) - ((pi)/(4)-theta )}]` ` " "= cot^(-1) [cot ""((pi)/(4) +theta )] =(pi)/(4) +theta ` ` y= (pi)/(4) +tan ^(-1) x,` जहाँ `x= tan thetarArrtheta tan^(-1) x (dy)/(dx) =(d)/(dx) ((pi)/(4) +tan ^(-1) x)` ` rArr (d)/(dx) ((pi)/(4) )+ (d)/(dx) (tan ^(-1) x ) =0+( 1)/((1+x^(2) )) =(1)/((1+x^(2))` |
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