Find the exact value of cos(4x) if tan(x) = == -2,7

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Q: verify that the equation is an identity 11x 6 COS + sin 4x -0

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Q: Find c if a = 2.35 mi, b = 3.28 mi and ZC = 41.9 degrees.

A: a=2.35mi,b=3.28mi and ∠C=41.9 degrees.

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