Решите неравенство: 4sin^2x≥2

Question

Решите неравенство: 4sin^2x≥2

Answer 1

Sin^2x>=1/2
1-cos2x>=1
cos2x<=0<br>pi/2+2pin<=2x<=3/2pi+2pin<br>

Comments

pi/4+pin<=x<=3/4pi+pin