Find the principal and general solutions of the equation $\sec x=2$
Find the principal and general solutions of the equation $\sec x=2$
$\sec x=2$
It is known that $\sec \frac{\pi}{3}=2$ and $\sec \frac{5 \pi}{3}=\sec \left(2 \pi-\frac{\pi}{3}\right)=\sec \frac{\pi}{3}=2$
Therefore, the principal solutions are $x=\frac{\pi}{3}$ and $\frac{5 \pi}{3}$ Now, sec $x=\sec \frac{\pi}{3}$
$\Rightarrow \cos x=\cos \frac{\pi}{3} \quad\left[\sec x=\frac{1}{\cos x}\right]$
$\Rightarrow 2 n \pi \pm \frac{\pi}{3},$ where $n \in Z$
Therefore, the general solution is $x=2 n \pi \pm \frac{\pi}{3},$ where $n \in Z$
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