<PRE><B>Question 669906</B>
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The cosine of anything varies between 1 and -1, so 2 times the cosine of anything varies between 2 and -2, so the smallest value that 2cos4x can assume is -2.  -2 plus -5 is 


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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