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[" If in "/ABC" ,with usual notations,"a...

[" If in "/_ABC" ,with usual notations,"alpha=],[18,b=24" ."=30" ,then "sin(A)/(2)" is equl to "],[[" a) "(1)/(sqrt(5))," b) "(1)/(sqrt(10))," ( ")(1)/(sqrt(15))," d) "(1)/(2sqrt(5))]]

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