Prove- a cos B - cos C - 2 b - csin 2A-2

Given that, [ a( cos #160; B+cos #160; C ) =2( b+c ) sin ^ 2 #160; A / 2 ...

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Sine Rule

Prove: a cos...

Question

Prove:
$a (cos B + cos C) = 2 (b + c) {sin}^{2} \frac{A}{2}$

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