What is the Pythagorean Identity?

Group of answer choices

LaTeX: x^2+y^2=r^2 x 2 + y 2 = r 2 x 2 + y 2 = r 2 x 2 + y 2 = r 2

LaTeX: a^2+b^2=c^2 a 2 + b 2 = c 2 a 2 + b 2 = c 2 a 2 + b 2 = c 2

LaTeX: \sin^2\Theta+\cos^2\Theta=1 sin 2 ⁡ Θ + cos 2 ⁡ Θ = 1 sin 2 ⁡ Θ + cos 2 ⁡ Θ = 1 sin 2 ⁡ Θ + cos 2 ⁡ Θ = 1

LaTeX: x^2+y^2=1 x 2 + y 2 = 1 x 2 + y 2 = 1 x 2 + y 2 = 1