$\int \frac{3 x^9+7 x^8}{\left(x^2+2 x+5 x^8\right)^2} d x=$

  • A
    $\frac{x^7}{5 x^7+x+2}+c$
  • B
    $\frac{x^7}{2\left(5 x^7+x+2\right)}+c$
  • C
    $\frac{1}{2\left(5 x^7+x+2\right)}+c$
  • D
    $\frac{-x^7}{2\left(5 x^7+x+2\right)}+c$

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$\int \frac{x}{\sqrt{1-2 x^4}} \, dx = $ (जहाँ $C$ समाकलन का एक स्थिरांक है)

$\int \frac{1}{x^2\sqrt{1+x^2}} dx =$

यदि $\int \cos ^k(x) \sin (x) d x = \frac{-1}{4} \cos ^4(x) + C$ है,तो $k$ का मान ज्ञात कीजिए।

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$\int(\sqrt{\tan x}+\sqrt{\cot x}) d x=$

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