I'm trying to show that 5+8cos\theta+4cos2\theta+cos3\theta\geq0 but keep going around in circles. Can anybody take a stab at it?
Last edited by mr fantastic; April 20th 2011 at 06:05 AM. Reason: Title.
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Uhm, what don't you know? Also, what have you tried and didn't work? Try to use and .
Originally Posted by Cairo I'm trying to show that 5+8cos\theta+4cos2\theta+cos3\theta\geq0 but keep going around in circles. Can anybody take a stab at it? A start would probably be to express and in terms of .
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