$\int e^x \cdot \cos 2x \, dx = $ . . . . . . $+ C$.

  • A
    $\frac{e^x}{5}(\cos 2x - 2 \sin 2x)$
  • B
    $\frac{e^x}{\sqrt{5}}(\cos 2x + 2 \sin 2x)$
  • C
    $\frac{e^x}{\sqrt{5}}(\cos 2x - 2 \sin 2x)$
  • D
    $\frac{e^x}{5}(\cos 2x + 2 \sin 2x)$

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$\int {\frac{{\log x}}{{{{(x + 1)}^2}}}dx} $ का मान क्या है?

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यदि $\int e^{x^2} \cdot x^3 \, dx = e^{x^2} f(x) + c$ और $f(1) = 0$ है (जहाँ $c$ समाकलन का एक स्थिरांक है),तो $f(x)$ का मान ज्ञात कीजिए।

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