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Cosa\\a+cosb\\b+cosc\\c=a2+b2+c2\\2abc |
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Answer» Please prove =>cosA/a=b^2+c^2-a^2 /2bc --(1)=> cosB/b=a^2+c^2-b^2/2ac-----(2)=>cosC/c=a^2+b^2-c^2 /2ab ----(3)=> adding three equation you get a^2+b^2+c^2/2abc its from external exercise Please prove that |
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