MathematicsHard45×since 2004Q5659If m and M are the minimum and the maximum values of 4 + 12{1 \over 2}21 sin² 2x −-− 2cos⁴ x, x ∈\in∈ R, then M −-− m is equal to :A154{{15} \over 4}415B94{{9} \over 4}49C74{{7} \over 4}47D14{{1} \over 4}41Check answerSkip