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[" 2."0.8" If "a+b=3-cos4 theta" and "a-...

[" 2."0.8" If "a+b=3-cos4 theta" and "a-b=4sin2 theta" ,then ab is always less than or equal to "],[[" (A) "(1)/(2)," (B) "1," (C) "(2)/(3)," (D) "(3)/(4)]]

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