[填空题]
The diagram below shows the slopy*v k q*cr6 ,tdo:irmf1)+v ras(xb(zgh)on; w8plqvp xr9;4 e field for the differential equation
$\frac{\mathrm{d} y}{\mathrm{~d} x}$=$\cos (x-y$), $\quad-6.5 \leq x \leq 4.5$, $\quad 0 \leq y \leq 5.5$ .
The graphs of the two solutions to the differential equation passing through points P (0,1) and Q(0,3) are drawn over the slope field.
For the two graphs given, the local maximum points lie on the straight line $L_{1} $.
1. Find the equation of $L_{1}$ , giving your answer in the form y=m x+c .
we get y = kx+c$\pi$;k= ,c=
For the two graphs given, the local minimum points lie on the straight line $L_{2} $.
2. Find the equation of $L_{2} $, giving your answer in the form y=m x+c .
we get y = kx+c$\pi$;k= ,c=
