$\int \frac{dx}{7 + 5\cos x} = $

  • A
    $\frac{1}{\sqrt{6}} \tan^{-1} \left( \frac{1}{\sqrt{6}} \tan \frac{x}{2} \right) + c$
  • B
    $\frac{1}{\sqrt{3}} \tan^{-1} \left( \frac{1}{\sqrt{3}} \tan \frac{x}{2} \right) + c$
  • C
    $\frac{1}{4} \tan^{-1} \left( \tan \frac{x}{2} \right) + c$
  • D
    $\frac{1}{7} \tan^{-1} \left( \tan \frac{x}{2} \right) + c$

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$\int \tan x \sec^2 x \sqrt{1 - \tan^2 x} \; dx = $

$\int x^{2019} \cdot e^{x^{2020}} \, dx = $ . . . . . . $+ C$.

यदि $f(x) = \int \frac{5x^{8} + 7x^{6}}{(x^{2} + 1 + 2x^{7})^{2}} dx$,$(x \geq 0)$,$f(0) = 0$ और $f(1) = \frac{1}{K}$ है,तो $K$ का मान ज्ञात कीजिए।

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