1.

`(dy)/(dx)` ज्ञात कीजिए : `y=sec^(-1)((1)/(2x^(2)-1)), 0 lt x lt (1)/(sqrt2)`

Answer» `y=sec^(-1)((1)/(2x^(2)-1))" "{:("माना "x=tan theta),(rArr theta= tan^(-1)x):}`
`rArr" "y=sec^(-1)((1)/(2cos^(2) theta-1))`
`=sec^(-1)((1)/(cos 2 theta))=sec^(-1)(sec 2 theta)`
`=2 theta= 2 cos^(-1)x`
`rArr" "(dy)/(dx)=2(d)/(dx)cos^(-1)x=(2)/(sqrt(1-x^(2)))`


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