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[" 2.If "A+B+C=180^(@)" ,then prove that...

[" 2.If "A+B+C=180^(@)" ,then prove that "tan^(2)(theta)/(2)=tan(B)/(2)tan(C)/(2)*" when "cos theta(sin B+sin C)=sin A],[" 3.If "A,B,C" are angles of a "/_ABC" ,then prove that "sin2A+sin2B-sin2C=4cos A cos8sin C" ."]

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