Trigonometry Calculator
Calculate sin, cos, tan and inverse trigonometric functions in degrees or radians with clear domain errors and steps.
Trigonometry calculator for DEG/RAD mode, identities, and inverse trig
Use this trigonometry calculator for sine, cosine, tangent, inverse trigonometry, and identity checks.
The DEG/RAD mode matters: degree examples such as sin(30°) and radian examples such as sin(pi/6) represent the same angle in different units.
Learn the concept
Try these examples
\sin(30^\circ)\cos(60^\circ)\tan(45^\circ)
Quick reference
sin²(x) + cos²(x) = 1.tan(x) = sin(x) / cos(x), where cos(x) ≠ 0.Radians = degrees × π/180.
FAQ
Should I use DEG or RAD?
Use DEG for degree values like 30° and RAD for radian values like pi/6.
Can I calculate sin, cos, and tan?
Yes. The calculator supports sin, cos, tan, and expressions around them.
Sources and review
- OpenStax Precalculus 2e, Unit Circle: Sine and Cosine Functions
- OpenStax Precalculus 2e, Inverse Trigonometric Functions
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