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sheima:
For an angle Θ with the point (12, −5) on its terminating side, what is the value of cosine?
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darkknight:
cos = adjacent/hypo. terminal side is the hypotenuse. Use the Pythagorean theorem when a = 12 and b = -5 to solve for c (13). Then use the formula cos(theta) = adj/hypo. Solve for theta
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