# tan, atan¶

Tangent and arctangent

## tan¶

Tangent

Syntax: tan x, tan[x]

Returns the tangent of x, taken to be in radians. Integer arguments are promoted to floating point. Null is returned if the argument is null or infinity.

q)tan 0 0.5 1 1.5707963 2 0w
0 0.5463025 1.557408 3.732054e+07 -2.18504 0n


## atan¶

Arctangent

Syntax: atan x, atan[x]

Returns the arctangent of x; that is, the value whose tangent is x. The result is in radians and lies between $-{\pi}{2}$ and ${\pi}{2}$. The range is approximate due to rounding errors.

q)atan 0.5
0.4636476
q)atan 42
1.546991


Basics: Mathematics