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[" 7.Given that "sin alpha=(sqrt(3))/(2)...

[" 7.Given that "sin alpha=(sqrt(3))/(2)" and "cos beta=0" ,then the value of "beta-alpha" is "],[[" (a) "0^(@)," (b) "90^(@)],[" (c) "60^(@)," (d) "30^(@)]]

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