1.

a cos ^(2) "" ( A) /(2)+ b cos ^(2) "" ( B)/(2)= c cos ^(2) "" ( C) /(2) =

Answer»

` s- ( R ) /( R) `
` s + ( r ) / ( R ) `
` s - (DELTA )/( R ) `
` s + ( Delta )/( R) `

ANSWER :D


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