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  4. The value of sin25° + sin2 10° + sin2 15° + + sin2 90° is

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Q. The value of $\sin^{2}5^{\circ} + \sin^{2} 10^{\circ} + \sin^{2} 15^{\circ} +$ _____ $+ \sin^{2} 90^{\circ}$ is

Solution:

Correct answer is (d) $9\frac{1}{2}$