dk $sin2x\neq 1\Leftrightarrow x\neq \frac{\pi}4+k\pi$vs dk tren $=>pt\Leftrightarrow cos^2x+2sinxcosx+3sin^2x+3\sqrt2sinx=2sinxcosx-1$
$\Leftrightarrow 2sin^2x+3\sqrt2sinx+2=0=>sinx=-\frac{\sqrt2}2=>x=-\frac{\pi}4+k2\pi$
hoac $x=- \frac{3\pi}4+k2\pi$
kl $x=-\frac{\pi}4+k2\pi$