The cosine of 50 degrees is approximately 0.6428. This value can be determined using a scientific calculator or trigonometric tables. In the context of a right triangle, it represents the ratio of the length of the adjacent side to the hypotenuse for an angle of 50 degrees.
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cos(42o) = 0.7431448255 ==============( approximately 37/50 )
It is: cos(0) = 1
cos(125) = cos(180 - 55) = cos(180)*cos(55) + sin(180)*sin(55) = -cos(55) since cos(180) = -1, and sin(180) = 0 So A = 55 degrees.
In radians: cos(42) = - 0.399965315 ---------------------- In degrees: cos(42) = 0.7431448255 ----------------------
cos(51°) ~ 0.63