Решите!!!!!!cos^2(х)<3/4

Question

Решите!!!!!!cos^2(х)<3/4

Answer 1

(1+cos2x)/2<3/4<br>1+cos2x<3/2<br>cos2x<1/2<br>π/3+3πn<2x<11π/6+2πn,n∈z<br>π/6+πn