1.

`(2sin 2x)/(cos^(2)2x)` का समाकलन कीजिये -

Answer» Correct Answer - `sec 2x`
माना `cos2x = t rArr -sin2x. 2dx = dt`
`rArr 2 sin 2xdx = - dt`
तब `I = - int(1)/(t^(2))dt = (1)/(t)= (1)/(cos2x)`


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