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If A+B+C=180^(@) , prove that: (i) "si...

If A+B+C=`180^(@)` , prove that:
(i) `"sin"^(2)+"sin"^(2)B-"sin"^(2)C=2 "sin"A sin B cos C `
(ii)`"sin"^(2)A-"sin"^(2)B+"sin"^(2) C=2 sin Acos B sin C.`

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