Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesMix Examples-Trigonometrical Ratios, Functions and Identities
Easy$\sin \frac{2 \pi}{5}+\sin \frac{4 \pi}{5}+\sin \frac{6 \pi}{5}+\sin \frac{8 \pi}{5}$ is equal to
- A$0$
- B$1$
- C$\frac{\sqrt{2}}{2}$
- D$\frac{1}{2}$
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View SolutionThe system of equations: $2x \cos^2 \theta + y \sin 2\theta - 2 \sin \theta = 0$,$x \sin 2\theta + 2y \sin^2 \theta = -2 \cos \theta$,and $x \sin \theta - y \cos \theta = 0$,for all values of $\theta$,can:
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