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Free online tangent calculator. tan(x) calculator. Inverse tangent calculator. Calculation of inverse tangent (no expression support):

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Free Online Inverse Cosine Calculator works in degrees or radians, plus draws triangle.

This tan-1 calculator is a very straightforward tool to use. Just input a number in the field and enjoy seeing the results in the blink of an eye! For instance, if you need to determine tan-1(3), just type 3 in the field x. You'll see that the result is 1.2490 radians, so a bit more than 71.5°.

Arctangent (arctan or tan⁻¹) is the inverse function of tangent. It answers the question: “What angle has this tangent value?” Enter the value of x (the tangent value). Select the desired unit (degrees or radians). Click “Calculate” to get the inverse tangent (angle). View the result, displayed in both degrees and radians.

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Specifically, the arctan is the inverse of the tangent. It is normally represented by arctan (θ) or tan -1 (θ). arctan = ? Calculator to give out the arctan value of a number.

In a right-angled triangle, the tangent of an angle (θ) is the ratio of its opposite side to the adjacent side. i.e., tan θ = (opposite side) / (adjacent side). Then by the definition of inverse tan, the inverse tan formula is, θ = tan -1 [ (opposite side) / (adjacent side) ] .

Thus tan-1 (–1) = –45° or tan-1 (–1) = –π/4. In other words, the range of tan-1 is restricted to (–90°, 90°) or . Note: arctan refers to "arc tangent", or the radian measure of the arc on a circle corresponding to a given value of tangent.