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.