TE_JEE MAIN 2020_090120_S1 - Competishun – Live JEE & NEET Courses and Exam Prep

JEE MAIN 2020

09-01-20 S1

Question

The value of
$\cos ^3\left(\frac{\pi}{8}\right) \cdot \cos \left(\frac{3 \pi}{8}\right)+\sin ^3\left(\frac{\pi}{8}\right) \cdot \sin \left(\frac{3 \pi}{8}\right)$ is

Select the correct option:

$\frac{1}{4}$

$\frac{1}{2 \sqrt{2}}$

$\frac{1}{2}$

$\frac{1}{\sqrt{2}}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

Question Tags

JEE Main

Mathematics

Easy

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