Решите неравенство f x 0 f(x)=2sin(п/3-x/√3)/4x - вопрос №909641002334 от anod7936 15.02.2020 10:22

Question

Алгебра: Решите неравенство f x 0 f(x)=2sin(п/3-x/√3)/4x

anod7936 · Answer

F`(x)=2cos(π/3-x/4)*(-1/4)-√3/4=-1/2*cos(x/4-π/3)-√3/4
cos(π/3-x/4)=cos(x/4-π/3) четная
-1/2*cos(x/4-π/3)-√3/4>0
1/2*cos(x/4-π/3)<-√3/4
cos(x/4-π/3)<-√3/2
5π/6+2πk<x/4-π/3<7π/6+2πk
7π/6+2πk<x/4<3π/2+2πk
14π/3+8πk<x<6π+8πk,k∈z

Решите неравенство f'x> 0 f(x)=2sin(п/3-x/√3)/4x