1.

यदि (If) `y="tan"^(-1)(x-sqrt(1-x^(2)))/(x+sqrt(1-x^(2))),` (find) `(dy)/(dx)` ज्ञात करें ।

Answer» `x=costheta` रखने पर,
`y=tan^(-1)((costheta-sintheta)/(costheta+sintheta))=tan^(-1)((1-tantheta)/(1+tantheta))`
`=tan^(-1)tan((pi)/(4)-theta)=(pi)/(4)-theta=(pi)/(4)-cos^(-1)x`
`therefore(dy)/(dx)=0-(-(1)/(sqrt(1-x^(2))))=(1)/(sqrt(1-x^(2)))`


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