 # Define sin and cos trignometric functions

There are a number of trigonometric formulas and identities which denotes the relation between the functions and help to find the angles of the triangle. The six trigonometric functions are Sine, Cosine, Tangent, Secant, Cosecant and Cotangent. The trigonometric functions are used to find the unknown angle or side of a right-angled triangle. In this article, we will learn about sin and cos functions.

Sin and Cos are basic trigonometric functions along with tan function, in trigonometry. Sine of angle is equal to the ratio of the opposite side and hypotenuse whereas cosine of an angle is equal to the ratio of adjacent side and hypotenuse.

## Sine function

Sine function of an angle is the ratio between the opposite side length to that of the hypotenuse.

Sin Θ =Opposite/Hypotenuse

## Cos function

Cos of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse

Cos Θ = Adjacent/Hypotenuse

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