A type of trig. function
Definition 1 is the simplest and most intuitive definition of the cosine function. It basically says that, on a right triangle, the following measurements are related:
the length of the triangle's hypotenuse
the length of one of the other sides
the measurement of the angle (q) adjacent to that other side
Graph of Cosine and Sine
Fundamental Trigonometric Identity
sin^2t + cos^2t = 1
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