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The arccos (or inverse cosine) of a number is the angle whose cosine is that number. It gives us the measure of an angle in radians or degrees.
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Cosine: The cosine of an angle is equal to the length of the adjacent side divided by the length of the hypotenuse in a right triangle.
Arcsin: The arcsin (or inverse sine) of a number is the angle whose sine is that number.
Arctan: The arctan (or inverse tangent) of a number is the angle whose tangent is that number.