Trigonometry Calculator
Exact trig values and the unit circleRuns locally · nothing uploaded
Calculate
Unit
Degrees
150°
Radians
5π/6 ≈ 2.617994
Quadrant
Quadrant II
| Function | Exact | Decimal |
|---|---|---|
| sin 150° | 1/2 | 0.5 |
| cos 150° | −√3/2 | -0.8660254 |
| tan 150° | −√3/3 | -0.57735027 |
| cot 150° | −√3 | -1.73205081 |
| sec 150° | −2√3/3 | -1.15470054 |
| csc 150° | 2 | 2 |
Reference angle: 30°
Also works as:trig calculatorexact trig valuesunit circle calculatorinverse trig calculatorsin cos tan of special angles
How it works
Formula
Reference angle: 180° − θ (QII), θ − 180° (QIII), 360° − θ (QIV)Signs: sin + in QI–II, cos + in QI and QIV, tan + in QI and QIIIWorked example
Given: sin, cos, tan of 150°
- Reference angle 30°, quadrant II.
Result: sin 150° = 1/2, cos 150° = −√3/2, tan 150° = −√3/3.
How to use
- 1Choose degrees or radians and enter an angle.
- 2Read exact and decimal values.
- 3Switch to inverse trig to find angles.
FAQ
What is sin 15° exactly?
(√6 − √2)/4 ≈ 0.2588.