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AP Calculus AB/BC
The cosine inverse, denoted as cos^{-1}, is an operation that returns the angle whose cosine is a given number. In other words, it calculates the angle whose cosine equals a specific value.
The cosine function calculates the ratio of the length of the adjacent side to the hypotenuse in a right triangle with respect to an acute angle x.
sin^{-1}(x): Similar to cos^{-1}, sin^{-1} (also known as arcsin) returns the angle whose sine is equal to a given value.
The tangent function determines the ratio of sin(x) to cos(x), representing the slope of a line in trigonometry.