F(x)=-4cosx/4
F(0)=-4
F(4П)=4
F(4П)-F(0)=8
x=4pi-x
x=2pi
y=2pi
S=1/2*4П*2П=4П^2
S=4П^2-8~4*9-8=28
отв. 28
F(x)=-4cosx/4
F(0)=-4
F(4П)=4
F(4П)-F(0)=8
x=4pi-x
x=2pi
y=2pi
S=1/2*4П*2П=4П^2
S=4П^2-8~4*9-8=28
отв. 28