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Guide

View our quick guide, or navigate through the menu to the left to find the definition and usage of each function provided by our calculator.

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Sine

Syntax

sin(x)

Definition

The sine function returns the sine of a number. The sine function is a function of an angle. Specifically, the sine of an acute angle in a right triangle, is defined as: the ratio of the length of the side opposite to that angle, to the hypotenuse of the triangle. More simply:
sin⁡(θ)=OppositeHypotenuse\sin(\theta)=\frac{Opposite}{Hypotenuse}

Examples

sin(0)
= 0

sin(π/2)
= 1