JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

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Application +4 | -1

\sin \frac{2 \pi}{7}+\sin \frac{4 \pi}{7}+\sin \frac{8 \pi}{7}

is equal to

View answer and explanation

Correct option: A

\frac{\sqrt{7}}{2}

Option A (

\frac{{\sqrt{{7}}}}{{2}}

) is correct because the sum of sines simplifies to

\frac{{\sqrt{{7}}}}{{2}}

using trigonometric identities and sum-to-product formulas.

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\mathrm{X}

\theta \rightarrow \frac{\pi}{2}

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