Question

$\int \frac{d x}{\cos (2 x) \cos (4 x)}$ is equal to

Accepted Answer

$\frac{1}{2 \sqrt{2}} \log \left|\frac{1+\sqrt{2} \sin 2 x}{1-\sqrt{2} \sin 2 x}ight|-\frac{1}{2}(\log |\sec 2 x-	an 2 x|)+C$

Answer

$\frac{1}{2 \sqrt{2}} \log \left|\frac{1+\sqrt{2} \sin 2 x}{1+\sqrt{2} \sin x}ight|-\frac{1}{2}(\log |\sec 2 x-	an 2 x|)+C$

Answer

$\frac{1}{\sqrt{2}} \log \left|\frac{1+\sqrt{2} \sin 2 x}{1-\sqrt{2} \sin 2 x}ight|-\frac{1}{2}(\log |\sec 2 x-	an 2 x|)+C$

Answer

None of the above

JEE MATHEMATICS MCQ: INDEFINITE INTEGRATION

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