1.

Evaluate `intsec^(2)x"cosec"^(2)xdx`.A. `tanx-cotx+C`B. `tanx+cotx+C`C. `-tanx+cotx+C`D. none of these

Answer» Correct Answer - A
`I=intsec^(2)x(1+cot^(2))dx=intsec^(2)xdx+intsec^(2)xcot^(2)xdx`.
`=tanx+int(1)/(cos^(2)x)*(cos^(2)x)/(sin^(2)x)dx=tanx+int"cosec"^(2)xdx`
`=tanx-cotx+C`.


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