Mathematics - Trigonometric Equation Question with Solution | TestHub

$\sec x=3\Rightarrow \cos x=\frac{1}{3}$

Which gives two values of $x$ in each of $[0,2\pi ],(2\pi ,4\pi ],(4\pi ,6\pi ]$ and one value in $6\pi +\frac{3\pi }{2}=15\frac{\pi }{2}$

∴ greatest value of n=15