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(42o) = 0.7431448255 ==============( approximately 37/50 )
cos(41 deg) = 0.7574
The value of cos 40 degrees is approximately 0.766.
Cos 43
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.
cos 315 degrees is 4th quadrant same as cos (-45) degrees which is +0.7071
cos 34o ≈ 0.829 cos 34 = 0.86074
cos(25o) = 0.906307787 ==========
I can answer if you tell me what cos means.
Cos(22.5)=0.9238795325
cos(495) = cos(495-360) = cos(135) = -cos(180-135) = -cos(45) = -sqrt(1/2) or -1/sqrt(2)
cos(22) is a trigonometric ratio and, if the angle is measured in degrees, its value is 0.9272
The cos of 2pi is 360 degrees which is 1.