cos^-1(1)
0
The expression cos^-1(1) can be interpreted as the inverse cosine of 1. In other words, we are looking for the angle whose cosine is equal to 1.
The cosine function is defined as the ratio of the adjacent side to the hypotenuse in a right triangle. Since the hypotenuse is always longer than the adjacent side, the cosine function can never be greater than 1. Therefore, the only angle whose cosine is equal to 1 is 0 degrees (or 360 degrees, or any multiple of 360 degrees).
Therefore, cos^-1(1) = 0 degrees (or 360 degrees, or any multiple of 360 degrees).
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