С решением пожалуйста

1)0}} \right." alt="\left \{ {{1-log_2x\geq0} \atop {x>0}} \right." align="absmiddle" class="latex-formula">

0}} \right." alt="\left \{ {{log_2x\leq1} \atop {x>0}} \right." align="absmiddle" class="latex-formula">

0}} \right." alt="\left \{ {{x\leq2} \atop {x>0}} \right." align="absmiddle" class="latex-formula">

$0< x \leq 2$

2) $-cos2x=1/2$

$cos2x=-1/2$

$2x=^+_-(\pi-\pi/3)+2\pi n$

$2x=^+_-2\pi/3+2\pi n$

$x=^+_-\pi/3+\pi n$