In a right angled triangle as shown in the figure below, the ratios are given by the following trigonometric functions of the known angle A, where a, b and c refer to the lengths of the sides in the accompanying figure

**Sine**function (sin), is defined as the ratio of the side opposite the angle to the hypotenuse.

**Tangent**function (tan), defined as the ratio of the opposite leg to the adjacent leg.

The reciprocals of these functions are named the cosecant (csc or cosec), secant (sec), and cotangent (cot), respectively:

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