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AP Calculus AB/BC
The secant of an angle in a right triangle is the ratio of the length of the hypotenuse to the length of the adjacent side.
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Tangent: The tangent of an angle in a right triangle is the ratio of the length of the opposite side to the length of the adjacent side.
Cosine: The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse.
Sine: The sine of an angle in a right triangle is the ratio of the length of the opposite side to the length of the hypotenuse.