I try to find the question but I didn't
How do you do it? I'm really stuck on this proof. Can someone please explain?
2026-05-15 12:41:10.1778848870
Prove that $\cos^2\theta+\sin^2\theta=1$
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Try geometrically: draw a unitary circle and an angle $\alpha$. Then $\sin\alpha$ and $\cos\alpha$ and the radius will form exactly a right angled triangle, and the formula you're searching for will be exactly the Pitagora Theorem.