1.

निम्न फलनों का x के सापेक्ष अवकलन कीजिए| `(i) y= sec ^(-1) ((sqrt x+1)/(sqrtx-1))+sin^(1) ((sqrt(x)-1)/(sqrtx+1))` `(iv ) ` यदि ` y= sec ^(-1) ((sqrt (x) )/(sqrtx-1)+sin ^(-1) ((sqrt(x)-1)/(sqrt(x)))` to ` (dy)/(dx)` का मान ज्ञात कीजिए|

Answer» `(i) y= sec ^(-1) ((sqrt(x)+1)/(sqrt(x)-1))+sin ^(-1)((sqrt(x)-1)/(sqrt(x)+1))`
` =cos ^(-1) ((sqrt (x)-1)/(sqrt(x)+1))+sin ^(-1) ((sqrt(x-1))/(sqrt(x)+1)) `
` " "[ because sec^(-1) x=cos ^(-1) (1//3)]`
` " "y= (pi)/(2) " "therefore (dy)/(dx) =0`
`(iv) ` माना ` " "y=sec ^(-1) ((sqrt(x) )/(sqrtx-1))+sin^(-1) ((sqrt(x)-1)/(sqrt(x)))`
` " "=cos ^(-1) ((sqrt(x) -1)/(sqrt(x)))+sin ^(-1) ((sqrt(x)-1)/(sqrt(x))) = (pi)/(2) `
`therefore (dy)/(dx) =(d)/(dx)((pi)/(2) )=0`


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