• Pythagorean trigonometric identity

Pythagorean trigonometric identity (suomeksi)

Määritelmät:

• (lb, en, trigonometry) The equality $\backslash sin(x)^2\; +\; \backslash cos(x)^2\; =\; 1$, holding for all real and complex ''x'', equivalent to the application of the Pythagorean theorem to the unit circle.