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How do you solve $\frac{cos x}{2} - cos x = 1$ $cos x/2 - cosx=1$ ?

1 Answer

Apr 15, 2015

If $\frac{cos (x)}{2} - cos (x) = 1$ $cos(x)/2 -cos(x) = 1$
then
$cos (x) \cdot (\frac{1}{2} - 1) = 1$ $cos(x)*(1/2-1) =1$

$cos (x) \cdot (- \frac{1}{2}) = 1$ $cos(x)*(-1/2) = 1$

$cos (x) = - 2$ $cos(x) = -2$

$x = arccos (- 2)$ $x = arccos(-2)$

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