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OpenStudy (anonymous):
Find all values of x in the interval 0,2pi that satisfy the equation 2+cos2x=3 cosx
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OpenStudy (anonymous):
Well, 0 is one that satisfy that equation 2+cos(0)=3cos(0) 2+1=3*1 3=3
OpenStudy (alekos):
wish it was that easy! you need to use the identity cos2x=2cos^2x+1 and then you get a quadratic which needs to be solved for cosx
OpenStudy (anonymous):
Ohh, now it looks easy...
OpenStudy (alekos):
have you worked it out yet?
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