JEE Math Practice Question
If m and M are the minimum and the maximum values of 4 + $${1 \over 2}$$ sin2 2x $$-$$ 2cos4 x, x $$ \in $$ R, then M $$-$$ m is equal to :
- A.$${{15} \over 4}$$
- B.$${{9} \over 4}$$
- C.$${{7} \over 4}$$
- D.$${{1} \over 4}$$
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