Q. The value of $sin^{2} 5^{\circ} + sin^{2} 1 0^{\circ} + sin^{2} 1 5^{\circ} +$ _____ $+ sin^{2} 9 0^{\circ}$ is

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A

$7 \frac{1}{2}$

B

$8 \frac{1}{2}$

C

$1 \frac{1}{2}$

D

$9 \frac{1}{2}$

Solution:

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