Why does sine squared plus cosine squared equal 1?

Описание к видео Why does sine squared plus cosine squared equal 1?

Have you ever been told that sine squared plus cosine squared equals one? Did your teacher explain why that's true? This is the most important pythagorean identity in all of trig (trigonometry), and it's never explained! In this video we'll show why sine squared plus cosine squared must equal one!

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