The cosine of an angle is the ratio of the length of the adjacent side to the hypotenuse in a right triangle.
Imagine you are at a party and want to know how close you are to the snacks table. The cosine of your angle from the snacks table would be the ratio of how close you are (adjacent side) to how far away it is (hypotenuse).
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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