# How sec and cosec are defined?

Trigonometry equalities, inequalities and expressions - sin, cos, tan, cot

the functions
sec and cosec
sec cosec

### Re: How sec and cosec are defined?

Trigonometry is the study of certain ratios associated with right triangles, and these ratios are called the trigonometric functions.

The sine of an angle is the ratio of the length of the side opposite the angle to the length of the hypotenuse. If the length of the side opposite the angle is 1, and the length of the hypotenuse is 2, then the sine of the angle = 1/2.

The cosecant is the reciprocal of the sine that is the ratio of the hypotenuse to the length of the side opposite the angle, in this example 2/1.

The cosine of an angle is the ratio of the length of the adjacent side of the angle to the length of the hypotenuse.

The secant is the reciprocal of cosine that is the ratio of the length of the hypotenuse to the length of the adjacent side of the angle.

Please look at http://www.sosmath.com/trig/Trig2/trig2/trig2.html for a diagram of these functions.

Joseph

### Re: How sec and cosec are defined?

Thank you Joseph.
Now it is almost clear to me and I think I can explain myself sec

sec cosec

### Re: How sec and cosec are defined?

explanation of sec and cosec :-
Secant ? = (length of hypotenuse side) / (length of adjacent side)
Cotangent ? = (length of adjacent side) / ( length of opposite side)
if you want more explaination about trigonometry help than log on to
http://math.tutorvista.com/trigonometry/trigonometric-ratios.html
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