Q. If cos $2 0^{\circ}$ - sin equal to 20 $2 0^{\circ}$ = p, then cos 40 $2 0^{\circ}$ is

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A

$p^{2} 2 - p^{2}$

0%

B

$p 2 - p^{2}$

50%

C

$p + 2 - p^{2}$

50%

D

$p - 2 - p^{2}$

0%

Solution:

Correct answer is (b) $p 2 - p^{2}$