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Mathematics
KingPizza:

Which pair of expressions is equal to −2√2? A: sin 3π/4and cos 3π/4 B: sin 5π/4and sin7π/4 C: cos 3π/4 and sin9π/4 D: cos π/4 and cos 3π/4

darkknight:

look at unit circle, remember cos is x values and sin is y values

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