To be honest, I always knew that the square of the hypotenuse is equal to the sum of the squares of the legs and for the first time I see the subtraction of the double product of the legs multiplied by the cosine of the right angle. Let's just say that I only superficially remember mathematics and geometry, and the lack of knowledge of English does not allow me to understand the video, but it's interesting to see something that I have not encountered.
!CTP
RE: Trigonometry: Proof of Law of Cosines (and Pythagorean Theorem)
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