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Mathematics
cos2 10° + cos2 50° - cos 10° cos 50° is equal to
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Q. $cos^2 10^{\circ} + cos^2 50^{\circ} - cos 10^{\circ} cos 50^{\circ}$ is equal to
A
$\frac{3}{4}$
B
$\frac{3}{2}$
C
$\frac{3}{2}(cos 20^{\circ + 1})$
D
$\frac{3}{4}(cos 20^{\circ} + 1)$
Solution:
Correct answer is (a) $\frac{3}{4}$