Вопрос в картинках...

0\to\\\\\sqrt2cosx\ne 1,\; cosx\ne \frac{1}{\sqrt2},\; x\ne \pm\frac{\pi}{4}+\pi n,n\in Z\\\\\sqrt2cosx>0,cosx>0,2\pi k0\to\\\\\sqrt2cosx\ne 1,\; cosx\ne \frac{1}{\sqrt2},\; x\ne \pm\frac{\pi}{4}+\pi n,n\in Z\\\\\sqrt2cosx>0,cosx>0,2\pi k

$1).\; tgx=-\sqrt3,\\x=-\frac{\pi}{3}+\pi m,\; m\in Z\\\\2).\; log_{13}(2sin^2x)=0\\\\2sin^2x=1,\; sin^2x=\frac{1}{2},\; \frac{1-cos2x}{2}=\frac{1}{2}\\\\cos2x=0,\; 2x=\frac{\pi}{2}+\pi l,\; l\in Z\\\\x=\frac{\pi}{4}+\frac{\pi l}{2}\notin OOF\\\\Otvet:\; x=-\frac{\pi}{3}+\pi m,m\in Z$