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Online Calculators & Tools

Tangent Calculator

tan

Tangent calculation

Calculation with tan(angle deg|rad):

Inverse tangent calculator

tan-1
°
rad
rad

Arctan calculator

Tangent table

xtan(x)
degreesradians
-60°-π/3-1.732050808
-90°-π/2not defined
-30°-π/6-0.577350269
-45°-π/4-1
00
30°π/60.577350269
60°π/31.732050808
45°π/41
90°π/2not defined

 

Tangent rules

Rule nameRule
Symmetry

tan(-θ) = -tan θ

Symmetrytan(90°- θ) = cot θ
 tan θ = sin θ / cos θ
 tan θ = 1 / cot θ
Double angletan 2θ = 2 tan θ / (1 - tan2 θ)
Angles sumtan(α+β) = (tan α + tan β) / (1 - tan α tan β)
Angles differencetan(α-β) = (tan α - tan β) / (1 + tan α tan β)
Derivativetan' x = 1 / cos2(x)
Integral∫ tan x dx = - ln |cos x| + C
Euler's formulatan x = (eix - e-ix) / i (eix + e-ix)

 

Scientific calculator