$\int {{e^x} \left( {\frac{1}{x} - \frac{1}{{{x^2}}}} \right)} \,dx = $

  • A
    $ - \frac{{{e^x}}}{{{x^2}}} + c$
  • B
    $\frac{{{e^x}}}{{{x^2}}} + c$
  • C
    $\frac{{{e^x}}}{x} + c$
  • D
    $ - \frac{{{e^x}}}{x} + c$

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ધારો કે $f(t) = \int \left( \frac{1 - \sin(\ln t)}{1 - \cos(\ln t)} \right) dt$, $t > 1$ માટે. જો $f(e^{\pi/2}) = -e^{\pi/2}$ અને $f(e^{\pi/4}) = \alpha e^{\pi/4}$ હોય, તો $\alpha$ ની કિંમત શોધો.

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