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Feliz [49]
3 years ago
13

If cos(x) = Three-fourths and tan(x) < 0, what is cos(2x)?.

SAT
1 answer:
hichkok12 [17]3 years ago
3 0

Recall the double angle identity for cosine,

cos(2x) = 2 cos²(x) - 1

Then

cos(2x) = 2 (3/4)² - 1 = 1/8

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