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Find the value of cos2x=3/4.Find the two values of x.
5 years ago

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oobleck
cos2x = 3/4
2cos^2x - 1 = 3/4
2cos^2x = 7/4
cos^2x = 7/8
cosx = ±√(7/8) = ±0.935
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5 years ago

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