meeg
meeg meeg
  • 12-02-2017
  • Mathematics
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Find all solutions to the equation.

cos^2x + 2 cos x + 1 = 0

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arthurpdc
arthurpdc arthurpdc
  • 12-02-2017
[tex]
\cos^2(x)+2\cos(x)+1=0\\\\
(\cos(x)+1)^2=0\\\\
\text{So:}\\\\
\cos(x)+1=0\\\\
\cos(x)=-1\\\\
\boxed{x=\pi+2k\pi},~k\in\mathbb{Z}[/tex]
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Аноним Аноним
  • 12-02-2017
Hope this helps you.
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