$\int \frac{1}{\log a} (a^x \cos a^x) \, dx = $

  • A
    $\sin a^x + c$
  • B
    $a^x \sin a^x + c$
  • C
    $\frac{1}{(\log a)^2} \sin a^x + c$
  • D
    $\log \sin a^x + c$

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જો $f(x)+k$ એ $\int \frac{x^3}{\left(1+x^2\right)^3} d x$ નું $x=\tan \theta$ આદેશ લઈને મૂલ્ય મેળવીને મળે છે, અને $g(x)+c$ એ $\int \frac{x^3}{\left(1+x^2\right)^3} d x$ નું $x^2+1=z$ આદેશ લઈને મૂલ્ય મેળવીને મળે છે, તો $f(x)-g(x)+k-c=$

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