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Prove that 2R cos A = 2R + r - r(1)...

Prove that `2R cos A = 2R + r - r_(1)`

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To prove the equation \( 2R \cos A = 2R + r - r_1 \), we will follow a step-by-step approach. ### Step 1: Write down the equation to prove We start with the equation we need to prove: \[ 2R \cos A = 2R + r - r_1 \] ...
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