Монгол Бодлогын Сан

$\left\{ % \begin{array}{l} |4\sin 2x+3|>1 \\ x\in [90^{\circ};270^{\circ}] \\ \end{array} % \right. \Leftrightarrow \left\{ % \begin{array}{l} \sin 2x>\fbox{ab,c} \\ x\in [90^{\circ};270^{\circ}] \\ \end{array} % \right. %\Leftrightarrow \\ \Leftrightarrow x\in \Bigl[\fbox{de}^{\circ};\fbox{fgh}^{\circ}\Bigr[$.