tan0
0
The tangent (tan) of 0 degree is 0. This is because the tangent function is equal to the ratio of the opposite side and adjacent side of a right-angled triangle, where the angle is the one in question. When the angle is 0 degrees, the opposite side is zero, and the adjacent side is some non-zero value. Thus, the ratio of the opposite to adjacent sides (which is equal to the tangent of the angle) is 0 divided by a non-zero value, which evaluates to 0. Therefore, tan(0) = 0.
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