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barxatty [35]
3 years ago
13

Find all solutions to the equation. cos^2x + 2 cos x + 1 = 0

Mathematics
2 answers:
mixas84 [53]3 years ago
5 0
\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}
Umnica [9.8K]3 years ago
5 0
Hope this helps you.

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