Question

Guys, could you please tell me what is sin and cos and what it is mainly used for?

Experts Answer Only!

Answer 1

sin and cos are trigonometric ratios. They are mainly used for trigonometric sums.
Hope it helps.

Answer 2

Sine (abbreviated as sin) and cosine(abbreviated as cos) are trigonometric functions. They can be used in real life for finding things like heights of buildings, depth of oceans, the angles at which light will reflect and refract, distance between objects, areas of triangles, areas of polygons etc.
Right triangle definition,
$\sin( \alpha ) = opposite \: side \: \div hyptenuse$
$\cos( \alpha ) = adjacent \: side \div hypotenuse$
Unit circle definition
$\sin( \alpha ) = the \: y \: corordinate \: where \: the \: temiate \: ray \: touches \: the \: unit \: circle$
$\cos( \alpha ) = the \: x \: coordinate \: where \: the \: teminate \: ray \: touches \: the \: unit \: circle$