cosθ
Definition
The cosine of an angle is the ratio of the length of the adjacent side to the hypotenuse in a right triangle.
Related terms
sinθ: The sine of an angle is the ratio of the length of the opposite side to the hypotenuse in a right triangle.
tanθ: The tangent of an angle is equal to sinθ divided by cosθ, or opposite side divided by adjacent side in a right triangle.
Pythagorean Identity: A trigonometric identity that states cos²θ + sin²θ = 1, which holds true for any angle θ.
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