$\int {\frac{{\sec x(1 + \tan x)dx}}{{({e^{ - x}} + \sec x)}}} = f(x) + C$ જ્યાં $f(0) = \ln 2$ હોય,તો $f\left( {\frac{\pi }{4}} \right)$ શું થાય?

  • A
    $\ln \left( {1 + {e^{\frac{\pi }{4}}}\sqrt 2 } \right)$
  • B
    $\ln \left( {\sqrt 2 } \right)$
  • C
    $\ln \left( {2\sqrt 2 } \right)$
  • D
    $\ln \left( {\frac{{{e^{\frac{\pi }{4}}}}}{{\sqrt 2 }} + 1} \right)$

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$\int \frac{\cos 2 x}{(\sin x+\cos x)^{2}} d x$ ની કિંમત શું છે?

જો $\int \frac{\cos ^3 x}{\sin ^2 x+\sin ^4 x} d x=c-\operatorname{cosec} x-f(x)$ હોય,તો $f\left(\frac{\pi}{2}\right)=$

$\int \frac{1}{x+x \log x} \, dx = $ . . . . . . $+ C$.

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