TRIGONOMETRY GLOSSARY

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Title Description
Catenary Curve The curve formed by hanging a rope or chain between two posts is a Catenary Curve.
Its math function is that of the hyperbolic cosine function.
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Circular Functions Circular Functions are based on the properties of circles, which are plane figures where every point on the circle is equidistant from a center point. Play_video
Cofunctions Each of the six basic trigonometric functions have a cofunction.
Their names tell the story: sine and cosine, tangent and cotangent, secant and cosecant are each pairs of cofunctions.
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Cosecant One of the six basic trig functions, the Cosecant function is the reciprocal of the sine function, and the cofunction of the secant.
The Cosecant of theta can be expressed as (r/y) for an angle in standard position, or the ratio of hypotenuse over opposite side in a right triangle.
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Cosine One of the six basic trig functions, the Cosine is the cofunction of the sine function and the reciprocal of the secant function.
In standard position the Cosine of theta is (x/r).
In a right triangle the cosine of an angle is the ratio of the adjacent side to the hypotenuse.
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Cotangent One of the six basic trig function, Cotangent is both the reciprocal function and the cofunction of the tangent function.
For a right triangle, the Cotangent of an angle is the ratio of adjacent side to the opposite.
In standard position for angle theta, the Cotangent can be expressed as (x/y).
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