1.

` int _(pi//4)^(pi//2) "cosec"^(2)dx` is equal toA. `-1`B. 1C. 0D. `(1)/(2)`

Answer» Correct Answer - B
` int _(pi//4)^(pi//2) "cosec"^(2) x dx = [ -cotx ] _(pi//4)^(pi//2) = ( -cot. pi/2 + cot .pi/2 ) = 1 `


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