Thread: Help please!!!!
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Old October 9th, 2008, 11:09 AM
franckherve1 franckherve1 is offline
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Default -2 x (x+1) x (2-x) x cos120
cos 120=-1/2...so when you multiply the -2 by -1/2..you get one
so now you have (x+1)(2-x)=2x-x(squared)+2-x
=-x(squared)+x+2
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