Statement of The Identity
See also: Trigonometric functions and List of trigonometric identitiesMathematically, the Pythagorean identity states:
(Note that sin2 θ means (sin θ)2). This relation between sine and cosine is sometimes called the fundamental Pythagorean trigonometric identity.
If the length of the hypotenuse of a right triangle is 1, then the lengths of the legs are the sine and cosine of one of the angles. Therefore, this trigonometric identity follows from the Pythagorean theorem.
Read more about this topic: Pythagorean Trigonometric Identity
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