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Trigonometry (Free)
Calculate sin, cos, or tan for one angle.
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Full Trigonometry Suite

Calculate inverse trig (arcsin, arccos, arctan), secant, cosecant, cotangent, and solve triangles using the law of sines and cosines.

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Frequently Asked Questions

What are the three basic trigonometric functions?

Sine (sin), cosine (cos), and tangent (tan). For a right triangle: sin(θ) = opposite/hypotenuse, cos(θ) = adjacent/hypotenuse, tan(θ) = opposite/adjacent.

What is the unit circle?

The unit circle is a circle of radius 1 centred at the origin. Points on it are defined as (cos θ, sin θ), making it a visual tool to understand trig values for any angle.

How do I convert degrees to radians?

Multiply degrees by π/180. For example, 90° = 90 × π/180 = π/2 ≈ 1.5708 radians.