T=7+1=8
ω=2π/8=π/4
A=2
x=3,y=0
所以是f(x)=2sin(πx/4+π/4)
y=2sin(πx/4+π/4)+2sin(πx/4+π/2+π/4)
=2sin(πx/4+π/4)+2cos(πx/4+π/4)
=2√2sin(πx/4+π/4+π/4)
=2√2cos(πx/4)
-3π/2
T=7+1=8
ω=2π/8=π/4
A=2
x=3,y=0
所以是f(x)=2sin(πx/4+π/4)
y=2sin(πx/4+π/4)+2sin(πx/4+π/2+π/4)
=2sin(πx/4+π/4)+2cos(πx/4+π/4)
=2√2sin(πx/4+π/4+π/4)
=2√2cos(πx/4)
-3π/2