JEE MATHEMATICS MCQ: MULTIPLE AND SUBMULTIPLE ANGLES

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Analyzing +4 | -1

\left( {1 + \cos \,\,\frac{\pi }{8}} \right)\,\,\left( {1 + \cos \,\,\frac{{3\,\pi }}{8}} \right)\,\,\left( {1 + \cos \,\,\frac{{5\,\pi }}{8}} \right)\,\,\left( {1 + \cos \,\,\frac{{7\pi }}{8}} \right)

is equal to

View answer and explanation

Correct option: C

\frac{1}{8}

Option C (

\frac{1}{8}

) is correct because the given expression simplifies to

\frac{1}{8}

using trigonometric identities and properties of cosine.

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