如何用matlab求解类似反三角函数的方程组：x+y=5；arctan(y/x)+7=5x;

>> syms x y
>> [x,y]=solve('x+y=5','atan(y/x)+7=5*x')
x =
1.6244535398379722718155227031674
y =
3.3755464601620277281844772968326带有反函数的方程组如何求解？n1=1.4949;n2=n3=n4=n5=1.465;a=b=6e-10;lamda=1.55e-10;m=0:10;k0=2*pi/lamda;k3x^2=k0^2*(n1^2-n3^2)-kx^2k5x^2=k0^2*(n1^2-n5^2)-kx^2;kx*a=m*pi+atan(k3x./kx)+atan(k5x./kx);%如何求解kx，k3x，k5x