Trigonometric functions

Trigonometric functions explained: sine, cosine, tangent and more, including inverse functions. With the unit circle, graphs and real-world examples.

Pick a function or tool. Each has a calculator, a graph, the unit circle and an explanation of where it is used.

Sine (sin)

Calculate sine, see it on the unit circle and graph. With explanation and real-world examples.

Calculate cosine, see it on the unit circle and graph. With explanation and real-world examples.

Calculate tangent, see it on the unit circle and graph. With explanation and real-world examples.

Calculate cotangent, see it on the unit circle and graph.

Calculate secant, see it on the unit circle and graph.

Calculate cosecant, see it on the unit circle and graph.

Calculate arcsine – the angle whose sine is x.

Calculate arccosine – the angle whose cosine is x.

Calculate arctangent – the angle whose tangent is x.

Interactive unit circle: drag the angle and see sin, cos and tan at once. The best way to understand trigonometry.

Enter any two values (sides or angle) and solve the rest of a right triangle with trigonometry.