0=2cos^2x + 2*sqrt2 * cos x + 1
When I tried the quadratic formula, the discriminant was equal to zero. So i know this can be factored, but i do not know how to deal with sqrt2.
Thank you for your time
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Wow nice!!!, I have a question, how did you know to add and subtract the (sqrt2 / 2)^2 ?? Is it from experience?
Completing the Square.
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