sinx is one specific trigonometric function that gives us ratios between sides in right triangles. It takes an angle (in radians or degrees) as input and returns the ratio of the length of the side opposite the angle to the length of the hypotenuse.
Related terms
Trigonometric Functions: Mathematical functions that relate angles in a right triangle to ratios between sides.
Radians: A unit used to measure angles, where 1 radian corresponds to an arc with a length equal to its radius.
Hypotenuse: The longest side of a right triangle, which is opposite the right angle. It's also referred to as c in the Pythagorean theorem.