Question

Найти область определения arccos(2x+3)=п/3

Answer 1

$-1\leq 2x+3\leq 1 \\\\-3-1\leq 2x\leq -3+1\\\\-4\leq 2x\leq -2\\\\-2\leq x\leq -1$

О т в е т. $[-2;-1]$