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Can anyone please integrate any of these qs by parts? ?

Answer»

27. Substitute x=tanA we GET tan^-1(3tanA-tanA^3)/(1-3tanA^2)=tan^-1(TAN3A) as the above fraction is formula for tan3A. it is EQUAL to 3A=3tan^-1x. on INTEGRATING we get as above 3xtan^-1x-3/2log(1+x^2)+C.



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