A walkthrough, end to end.
- 1
Pick a function: sin, cos, tan, sec, csc, cot, or their inverses (asin, acos, atan).
- 2
Enter the angle (or value, for inverses) and choose degrees or radians.
- 3
See the result with high precision.
Trig identities
sin² + cos² = 1. tan = sin/cos. sec = 1/cos, csc = 1/sin, cot = 1/tan. Inverse trig returns the angle whose function equals the input.
What you can do with this.
Right-triangle homework
Solve for missing sides or angles.
Physics projectiles
Resolve velocity vectors using sin and cos.
Surveying & navigation
Bearings and triangulation rely on trig.
Engineering design
Compute stress angles and moments.
Computer graphics
Rotations use sin and cos pairs.
Music theory
Frequency relationships modeled with sinusoids.
Wave equations
Phase shifts via inverse trig functions.
Trig 2026 — what's current
Foundational; calculator wins for instant degree/radian toggling.
Frequently asked.
Both — toggle the unit selector. Inverse trig output uses the same selected unit.
Undefined — the function shows 'undefined' when cos = 0.
asin and acos require −1 ≤ x ≤ 1. atan accepts any real number.
No. All math runs in your browser.