1.

Evaluate:`inttan^4x dx`

Answer» `int tan^(4)xdx=int tan^(2)x tan^(2)xdx=int tan^(2)x(sec^(2)x-1)dx`
`=int tan^(2)x sec^(2)xdx-int tan^(2)xdx=(sec^(3)x)/(3)-int(sec^(2)x-1)dx`
`=(sec^(3)x)/(3)-tanx+x+C`


Discussion

No Comment Found

Related InterviewSolutions