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OpenStudy (anonymous):
cos^2x+6cosx+4=0
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OpenStudy (jdoe0001):
\(\bf cos^2(x)+6cos(x)+4=0\implies [{\color{brown}{ cos(x)}}]^2+6{\color{brown}{ cos(x)}}+4=0 \\ \quad \\ \implies a^2+6a+4\) solve it like you'd any quadratic
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