यदि $I=\int \frac{e^x}{e^{4 x}+e^{2 x}+1} \,d x$ और $J=\int \frac{e^{-x}}{e^{-4 x}+e^{-2 x}+1} \,d x$ है, तो किसी भी स्वेच्छ अचर $c$ के लिए, $J-I$ का मान क्या होगा?

  • A
    $\frac{1}{2} \log \left|\left(\frac{e^{4 x}-e^{2 x}+1}{e^{4 x}+e^{2 x}+1}\right)\right|+c$
  • B
    $\frac{1}{2} \log \left|\left(\frac{e^{2 x}+e^x+1}{e^{2 x}-e^x+1}\right)\right|+c$
  • C
    $\frac{1}{2} \log \left|\left(\frac{e^{2 x}-e^x+1}{e^{2 x}+e^x+1}\right)\right|+c$
  • D
    $\frac{1}{2} \log \left|\left(\frac{e^{4 x}+e^{2 x}+1}{e^{4 x}-e^{2 x}+1}\right)\right|+c$

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Difficult
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कथन $(A)$: यदि $I_n = \int \cot^n x \, dx$ है,तो $I_6 + I_4 = \frac{-\cot^5 x}{5}$ होगा।
कारण $(R)$: $\int \cot^n x \, dx = \frac{-\cot^{n-1} x}{n-1} - \int \cot^{n-2} x \, dx$.

$\int \left[ \log (1+\cos x) - x \tan \left( \frac{x}{2} \right) \right] dx =$

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