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[" 6.If "tan theta=(1)/(sqrt(7))," then ...

[" 6.If "tan theta=(1)/(sqrt(7))," then "(csc^(2)theta-sec^(2)theta)/(csc^(2)theta+sec^(2)theta)=],[[" (a) "(5)/(7)," (b) "(3)/(7)," (c) "(1)/(12)," (d) "(3)/(4)]]

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