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What do sin and cos mean in mathematics?
SIN is a sine function in trigonometric function and COS is a cosine function.

In the right triangle ABC, angle C is equal to 90 degrees, AB is the hypotenuse, BC is the opposite side of angle A, and AC is the opposite side of angle B..

Sine function is sin (a) = a/c.

Properties of sine function: sine resolution function: y=sinx.

The ratio of the adjacent side to the hypotenuse of Angle A is called cosine of Angle A, and it is denoted as cosA, that is, cosA= the adjacent side/hypotenuse of Angle A..