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यदि `y= tan ^(-1) ((sqrt(1+ x^(2))+1)/(x))` तब ` (dy)/(dx)` का मान ज्ञात कीजिए | |
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Answer» `y=tan ^(-1) ((sqrt(1+x^(2) )+1) /(x))` माना ` x tan theta ,` तब ` y= tan ^(-1) ((sectheta +1)/(tan theta ))=tan ^(-1) ((1+costheta )/(sin theta ))` ` =tan ^(-1) { (2cos ^(2) (theta //2))/(2sin (theta //2)cos (theta //2))}` ` =tan ^(-1) {cot ""(theta)/(2) } =tan ^(-1) {tan ((pi)/(2)-(theta )/(2))}` ` =((pi)/(2)-(theta )/(2) )= (pi)/(2) -(1)/(2) tan ^(_1) x ` ` therefore " "(dy)/(dx) =-(1)/(2(1+x^(2)))` |
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