-sin(4x-П/4)>-1/2
sin(4x-П/4)<1/2
t1=arcsin 1/2= П/6
t2= -П-П/6=-7П/6
t1>t2
-7П/6+2Пk<4x-П/4<П/6+2Пk, k€ Z
-7П/6+П/4+2Пk<4x<П/6+П/4+2Пk, k€ Z
-11П/12+2Пk<4x<5П/12+2Пk, k€ Z
-11П/48+Пk/2<x<5П/48+Пk/2, k€ Z
Жауабы (-11П/48+Пk/2; 5П/48+Пk/2), k€ Z
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