The value of cos 90° is 0.
In a unit circle, 90 degrees is located in the uppermost point, also known as the y-axis. The cosine of an angle is defined as the ratio of the adjacent side of a right-angled triangle to the hypotenuse. In a unit circle, the hypotenuse is always 1 unit length.
At 90 degrees, the adjacent side is 0 units while the hypotenuse is 1 unit. Thus, the cosine of 90 degrees is 0/1 = 0.
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