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∫1(x−1)3/4(x+2)5/4 dx\displaystyle\int \dfrac{1}{(x-1)^{3/4}(x+2)^{5/4}}\, dx is equal to :

[where C is an arbitrary constant]

Solution

✅ Correct Option: 2

Write the denominator as (x+2)2(x−1x+2)3/4(x+2)^2\left(\dfrac{x-1}{x+2}\right)^{3/4}.

Put t=x−1x+2t=\dfrac{x-1}{x+2}, so dt=3(x+2)2dxdt=\dfrac{3}{(x+2)^2}dx.

Integral =13∫t−3/4dt=43t1/4+C=43(x−1x+2)1/4+C=\dfrac{1}{3}\int t^{-3/4}dt=\dfrac{4}{3}t^{1/4}+C=\dfrac{4}{3}\left(\dfrac{x-1}{x+2}\right)^{1/4}+C.

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