Trig {base} | R Documentation |

## Trigonometric Functions

### Description

These functions give the obvious trigonometric functions. They
respectively compute the cosine, sine, tangent, arc-cosine, arc-sine,
arc-tangent, and the two-argument arc-tangent.

### Usage

cos(x)
sin(x)
tan(x)
acos(x)
asin(x)
atan(x)
atan2(y, x)

### Arguments

### Details

The arc-tangent of two arguments `atan2(y,x)`

returns the angle
between the x-axis and the vector from the origin to *(x,y)*,
i.e., for positive arguments `atan2(y,x) == atan(y/x)`

.

Angles are in radians, not degrees (i.e., a right angle is
*π/2*).

All except `atan2`

are generic functions: methods can be defined
for them individually or via the `Math`

group generic.

### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
*The New S Language*.
Wadsworth & Brooks/Cole.

[Package

*base* version 2.1.0

Index]