Trigonometry Calculator
Compute trigonometry: sin, cos, tan in degrees or radians with triangle solving. Find the opposite side from 30° hypotenuse 10 (= 5) — free, local, no signup.
How to Use the Trigonometry Calculator
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Frequently Asked Questions
Degrees or radians?
Both — degrees for geometry homework, radians for calculus. Mode toggle sits beside inputs; wrong-mode answers are the classic error.
Solve triangles too?
Yes — side-angle-side and angle-side combos solve fully with remaining sides and angles. SOH-CAH-TOA under the hood.
Inverse functions?
arcsin/arccos/arctan return angles from ratios — range limits respected (arcsin beyond ±1 is undefined).
Do triangle numbers upload?
No — math runs locally in your browser. Numbers never leave your device.
What does the 45° default print?
sin = cos = 0.707107, tan = cot = 1.000000, csc = sec = 1.414214 — six functions to 6 places with a CSV download. Flip the toggle to radians before entering calculus-style angles; 45 radians looks nothing like 45 degrees.
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Last updated October 2026