Could anyone help on this trig identity? I have a quiz tomorrow and am unsure on this one. 2 cos squared x- 5 cosx+ 2= 0 Any help is appreciated!
Last edited by mr fantastic; Feb 16th 2011 at 05:38 PM. Reason: Re-titled.
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Do you mean solve this equation for $\displaystyle \displaystyle x$ ? If so make $\displaystyle \displaystyle u=\cos x$ and solve the quadratic $\displaystyle \displaystyle 2u^2-5u+2=0$
Originally Posted by powerduffgirL Could anyone help on this trig identity? I have a quiz tomorrow and am unsure on this one. 2 cos squared x- 5 cosx+ 2= 0 ... recommend you find out the difference between identities and conditional equations.
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