Question

Prove that :- Sin²+ cos² = 1​

Answer 1

Answer:

The Pythagorean identity says that sin²(x) + cos²(x) = 1 no matter what x you plug in. (It's a consequence of the Pythagorean theorem.) There are other variants too, like tan²(x) + 1 = sec²(x) when you divide both sides by cos²(x).