Hence, this graph represents the tangent function. In other words, the graph of a tangent function contains vertical asymptotes, while the graphs of the sine and cosine functions are bounded between 1 and 1. The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side that is opposite that angle to the length of the longest side of the triangle (the hypotenuse), and the cosine is the ratio of the length of the adjacent leg to that of the hypotenuse. Among sine, cosine, and tangent functions, the tangent function is the only one that grows without bound. In mathematics, sine and cosine are trigonometric functions of an angle.
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