Trigonometric Functions Calculator
Calculate sine, cosine, tangent and their inverses. Choose between degrees and radians.
sin(θ)
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cos(θ)
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tan(θ)
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Angle
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Trigonometric Functions
Trigonometric functions relate angles to sides of a right triangle.
Basic Definitions
sin(θ) = opposite/hypotenuse
cos(θ) = adjacent/hypotenuse
tan(θ) = opposite/adjacent = sin(θ)/cos(θ)
cos(θ) = adjacent/hypotenuse
tan(θ) = opposite/adjacent = sin(θ)/cos(θ)
Common Values
| θ (degrees) | sin(θ) | cos(θ) | tan(θ) |
|---|---|---|---|
| 0° | 0 | 1 | 0 |
| 30° | 1/2 | √3/2 | 1/√3 |
| 45° | √2/2 | √2/2 | 1 |
| 60° | √3/2 | 1/2 | √3 |
| 90° | 1 | 0 | undefined |
Pythagorean Identity
sin²θ + cos²θ = 1
Frequently Asked Questions
What is the difference between degrees and radians?
Degrees and radians are two units for measuring angles. A full circle is 360 degrees or 2π radians. To convert: radians = degrees × π/180, degrees = radians × 180/π.