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$Download Lagu For any triangle ABC, prove that `a(cos-C-cos B)\\ =\\ 2\\ (b c)\\ cos^2A/2`...$	For any triangle ABC, prove that `a(cos-C-cos B)\\ =\\ 2\\ (b c)\\ cos^2A/2`... (Doubtnut) View
	In any triangle ABC, prove the following:(cosC-cosB)=2(b-c)cos^2A/2. (GLOBAL MATHEMATICS) View
$Download Lagu For any triangle ABC, prove that `a(cos-C-cos B)\\ =\\ 2\\ (b c)\\ cos^2A/2`...$	For any triangle ABC, prove that `a(cos-C-cos B)\\ =\\ 2\\ (b c)\\ cos^2A/2`... (Doubtnut) View
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