Trigonometry
sin, cos, tan and their inverses for any angle.
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The formula
sin θ, cos θ, tan θ
Sine, cosine and tangent relate an angle to the side ratios of a right triangle — and, on the unit circle, to coordinates. Tangent is simply sine ÷ cosine, which is why it shoots off to infinity wherever cosine passes through zero.
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Frequently asked questions
How do I convert degrees to radians?+
Multiply degrees by π/180. So 180° = π radians ≈ 3.14159.
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