1.

`(dy)/(dx)` निकालें यदि (Find`(dy)/(dx)if)y=sec^(-1)((sqrt(x)+1)/(sqrt(x)-1))+sin^(-1)((sqrt(x)-1)/(sqrt(x)+1))`

Answer» `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"cosec"^(-1)x="sin"^(-1)(1)/(x)]`
`=(1)/(2)pi " " [becausecos^(-1)x+sin^(-1)x=(1)/(2)pi]`
`therefore(dy)/(dx)=0`


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