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Q.
If 2 cos x + 2 cos 3x = cos y and 2 sin x + 2 sin 3x = sin y then cos 2x =
A.
-7/8
B.
-1/8
C.
1/8
D.
7/8
E.
None of the above
View Answer
Correct choice: A
Explanation:
None
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