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The value of `cos [tan^-1 {sin (cot^-1 x)}]` isA. `sqrt(x^(2)+2)/(x^(2)+3)`B. `sqrt(x^(2)+2)/(x^(2)+1)`C. `sqrt(x^(2)+1)/(x^(2)+2)`D. none of these |
Answer» We have `cos[tan^(-1) sin(cot(-1)x)]` `cos{tan^(-1)(1)/sqrt(1+x^(2))}=sqrt(1+x^(2))/sqrt(2+x^(2))=sqrt(1+x^(2))=sqrt(1+x^(2))/(2+x^(2))` |
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