MIYAISSAVGE4273 MIYAISSAVGE4273

15-11-2021
SAT

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

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LammettHash LammettHash

15-11-2021

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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