1.

`cos^(-1) (cos (2 cot^(-1) (sqrt2 -1)))` is equal toA. `sqrt2 -1`B. `(pi)/(4)`C. `(3pi)/(4)`D. none of these

Answer» Correct Answer - C
`cos^(-1) (cos (2 cot^(-1) (sqrt2 -1))) = cos^(-1) (cos (2(67.5^(@))))`
`= cos^(-1) (cos (135^(@)))`
`= 135^(@) = (3pi)/(4)`


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