SOLUTION: 3cos^2a+2=3-2cosa

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Question 593464: 3cos^2a+2=3-2cosa
Answer by lwsshak3(11628) About Me  (Show Source):
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3cos^2a+2=3-2cosa
3cos^2a+2cosa-1=0
(3cosa-1)(cosa+1)=0
..
3cosa-1=0
3cosa=1
cosa=1/3
a≈70.5º
or
cosa+1=0
cosa=-1
a=180º