समाकलन ज्ञात कीजिए: $\int \frac{dx}{\sin x + \sin 2x}$

  • A
    $\frac{1}{6} \log (1-\cos x) + \frac{1}{2} \log (1+\cos x) + \frac{2}{3} \log |1+2 \cos x| + c$
  • B
    $\frac{1}{6} \log (1-\cos x) - \frac{1}{2} \log (1+\cos x) - \frac{2}{3} \log |1+2 \cos x| + c$
  • C
    $\frac{1}{6} \log (1-\cos x) + \frac{1}{2} \log (1+\cos x) - \frac{2}{3} \log |1+2 \cos x| + c$
  • D
    $\frac{1}{6} \log [(1-\cos x)(1+\cos x)|1+2 \cos x|] + c$

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$\int \frac{dx}{1 + x + x^2 + x^3} = $

यदि $\int \frac{x^4+1}{x(x^2+1)^2} dx = A \log |x| + \frac{B}{1+x^2} + c$ है,तो $A-B$ का मान ज्ञात कीजिए (जहाँ $c$ समाकलन स्थिरांक है)।

यदि $\int \frac{x+3}{(x-1)^2(2 x-1)} d x=\frac{A}{x-1}+B \log (2 x-1)+C \log (x-1)+K$ है, तो $A+B+C=$

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