Question

Решить неравенство
$sqrt{2} cosx textless 1$

Answer 1

$sqrt{2}cos x textless 1;$
$cos x textless frac{1}{ sqrt{2} }$
$cos x textless frac{ sqrt{2} }{2}$
$frac{ pi }{4}+2 pi n textless x textless - frac{ pi }{4} + 2 pi n$