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trigonometric function
Any of the functions sine (sin), cosine (cos), tangent (tan), secant (sec), cosecant (cosec), or cotangent (cot), or their inverses, sin-1, etc, which deal with certain proportions in right triangles. For example, the sine of an angle θ, sin θ, in a right triangle, is equal to the side opposite the angle divided by the hypotenuse (the longest side). The plane curve generated by a trigonometric function is called a trigonometric curve.
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• MATHEMATICS
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