Inverse Tangent Calculator

Trigonometric inverse tangent calculator

# What is inverse tangent?

Inverse tangent is the inverse of basic tan function. In the tan function, value of angle θ is taken to give the ratio opposite/adjacent. However, inverse tan function takes the ratio opposite/adjacent and gives angle θ.

tan-1 (opposite/adjacent) = θ

Inverse tangent symbol

Inverse tangent is represented as tan-1 or arctan.

# Inverse tangent rule

The inverse tan rule is given as:

y = tan-1 (x)


tan-1(-x) = -tan-1(x), where x ∈ R

Inverse tangent derivative

The derivative of inverse tangent function is first-order derivative. It is given as:

dy/dx = 1 / 1 + x2