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To solve this equation, you must first put the equation in terms of cosx.
3cosx=2
cosx = 2/3
Next, you find the reference angle (α) by finding the cos inverse of 2/3.
α=cos-1(2/3) = 48.19 Degrees (approximately)
find the distance from from 48.19 and 90 you then add the difference to 270 giving you the two answers which are ... 48.19 and 311.81 (approximately)
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