y=6x+2pi-5cosx-7
y'=6+5cosx
5cosx=-6
cosx=-6/5 - нет решений
f(pi/3) = 6(pi/3)+2pi-5cos(pi/3)-7 = 3.066
f(4) = 6(4)+2pi-5cos(4)-7 = 26.55
y=6x+2pi-5cosx-7
y'=6+5cosx
5cosx=-6
cosx=-6/5 - нет решений
f(pi/3) = 6(pi/3)+2pi-5cos(pi/3)-7 = 3.066
f(4) = 6(4)+2pi-5cos(4)-7 = 26.55