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[" 29.If "tan theta=t" ,then "tan2 theta...

[" 29.If "tan theta=t" ,then "tan2 theta+sec2 theta=],[[" (A) "(1+t)/(1-t)," (B) "(1-t)/(1+t)],[" (C) "(2t)/(1-t)," (D) "(2t)/(1+t)]]

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