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Mathematics
Value of cos2(A - B) + cos2 B - 2 cos(A - B) cos A cos B is
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Q. Value of $cos^2(A - B) + cos^2 B - 2 cos(A - B) cos A cos B$ is
A
$cos^2 A $
B
$sin^2 A $
C
$tan^2 A $
D
$cot^2 A. $
Solution:
Correct answer is (b) $sin^2 A $