$\int {\sqrt {{x^2} + {a^2}} \,dx} $ ની કિંમત શોધો.

  • A
    $\frac{x}{2}\sqrt {{x^2} + {a^2}} - \frac{{{a^2}}}{2}\log \left| x + \sqrt {{x^2} + {a^2}} \right| + C$
  • B
    $\frac{x}{2}\sqrt {{x^2} + {a^2}} + \frac{{{a^2}}}{2}\log \left| x + \sqrt {{x^2} + {a^2}} \right| + C$
  • C
    $\frac{x}{2}\sqrt {{x^2} + {a^2}} - \frac{{{a^2}}}{2}\log \left| x - \sqrt {{x^2} + {a^2}} \right| + C$
  • D
    $\frac{x}{2}\sqrt {{x^2} + {a^2}} + \frac{{{a^2}}}{2}\log \left| x - \sqrt {{x^2} + {a^2}} \right| + C$

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જો $f(x) = \int \left[ \tan^2 x + \cot^2 x + \frac{4(\sin^3 x + \cos^3 x)}{\sin^2 2x} \right] dx$ અને $f\left(\frac{\pi}{4}\right) = 0$ હોય,તો $3 \left[ f\left(\frac{\pi}{6}\right) + 2 \right] = $

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