Invariante angular

By carlos gomes

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Invariante angular

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  • \[O(0,0), \quad B(1,0), \quad C(-\sin\beta,\,\cos\beta)\]\[A_{OABC} =\begin{vmatrix}x_B & y_B\\x_C & y_C\end{vmatrix}= 1\cdot\cos\beta - (-\sin\beta)\cdot0 = \cos\beta\]\[\text{Logo, } \boxed{\cos\bet
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