Question

IF A + B + C = 3π/2. then cos 2A + cos2B + cos2C is equal to
(1) 1 - 4cos A cosB cosC
(2) 4 sin A sin B sin C
(3) 1 + 2 cos A cos B cos C
(4) 1-4 sin A sin B sin C​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

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