MCQ
$\int_{}^{} {\frac{1}{{{{[{{(x - 1)}^3}{{(x + 2)}^5}]}^{1/4}}}}\;dx} $=
  • $\frac{4}{3}{\left( {\frac{{x - 1}}{{x + 2}}} \right)^{1/4}} + c$
  • B
    $\frac{4}{3}{\left( {\frac{{x + 2}}{{x - 1}}} \right)^{1/4}} + c$
  • C
    $\frac{1}{3}{\left( {\frac{{x - 1}}{{x + 2}}} \right)^{1/4}} + c$
  • D
    $\frac{1}{3}{\left( {\frac{{x + 2}}{{x - 1}}} \right)^{1/4}} + c$

Answer

Correct option: A.
$\frac{4}{3}{\left( {\frac{{x - 1}}{{x + 2}}} \right)^{1/4}} + c$
(a)$\int_{}^{} {\frac{1}{{{{[{{(x - 1)}^3}{{(x + 2)}^5}]}^{1/4}}}}} \,dx = \int_{}^{} {\frac{1}{{{{\left( {\frac{{x - 1}}{{x + 2}}} \right)}^{3/4}}{{(x + 2)}^2}}}} \,dx$
$ = \frac{1}{3}\int_{}^{} {\frac{1}{{{t^{3/4}}}}\,dt} $,  $\left\{ {\because \,\,\,\frac{{x - 1}}{{x + 2}} = t \Rightarrow \frac{3}{{{{(x + 2)}^2}}}\,dx = dt} \right\}$
$ = \frac{1}{3}\left( {\frac{{{t^{1/4}}}}{{1/4}}} \right) + c = \frac{4}{3}{t^{1/4}} + c = \frac{4}{3}{\left( {\frac{{x - 1}}{{x + 2}}} \right)^{1/4}} + c$.

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