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In any triangle A B C , prove the projec...

In any triangle `A B C ,` prove the projection formula`a=b cosC+ c cosB` using vector method.

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To prove the projection formula \( a = b \cos C + c \cos B \) using vector methods, we can follow these steps: ### Step 1: Define the Vectors Let the vertices of triangle \( ABC \) be represented by position vectors: - \( \vec{A} \) at point \( A \) - \( \vec{B} \) at point \( B \) - \( \vec{C} \) at point \( C \) ...
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