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[" 18.If "theta" is an acute angle such that "sec^(2)theta=3" ,then the value of "(lan^(2)theta=cosec^(2)theta)/(tan^(2)theta+cosec^(2)theta)" .Is "],[[" (a) "(4)/(7)," (b) "(3)/(7)," (c) "(2)/(7)," (d) "(1)/(7)]]

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