SOLUTION: I need help solving the following equation for 0(<=) X (<=)2pi 2cos^2X

SOLUTION: I need help solving the following equation for 0(<=) X (<=)2pi 2cos^2X - 3cosX-2=0 Thank you!

Question 337025: I need help solving the following equation for 0(<=) X (<=)2pi
2cos^2X - 3cosX-2=0
Thank you!
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Use a substitution,

Two solutions:

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.
.
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No solutions.

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