31-03-2022
Mathematics

contestada

exact value of cos 255

Respuesta :

31-03-2022

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

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