cos(495) = cos(495-360) = cos(135) = -cos(180-135) = -cos(45) = -sqrt(1/2) or -1/sqrt(2)
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The cosine of 495 degrees can be found using the unit circle. To do this, we convert 495 degrees to its equivalent angle within the unit circle, which is 135 degrees. The cosine of 135 degrees is -√2 / 2. Therefore, cos 495 degrees is also -√2 / 2.
Cos 43
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 ==========
The cosine of 70 degrees is 0.34202014332567.