Exact value of cos 255

asked Aug 27, 2023 115k views

8 votes

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8 votes

Answer:

Third quadrant occurs when x is negative and y is negative

180 - 270 deg describes the third quadrant

cos = adj / hypotenuse

hypotenuse is positive

255 = 180 + 75

cos 255 = - cos 75 = -.2588

Miyuru answered Sep 2, 2023

3.5k points

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