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If sin(x) = 4/5, find cos(2x).

A) 7/25
B) -7/25
C) 24/25
D) -24/25

Correct Answer: B) -7/25

cos(2x) = 1 - 2sin²(x). 1 - 2(16/25) = 1 - 32/25 = (25-32)/25 = -7/25.

Related One Liners:
• sin²x + cos²x = 1.

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