How can i solve the fallowing function for finding the value of ncutL??

syms ncutL %na=2.0; %nb=1.5; %a=0.211*10^-6; %b=0.305*10^-6; %lambda=1.55*10^-6; %k0=(6.28/lambda); %ka=k0*sqrt(na^2-ncutL^2); %kb=k0*sqrt(nb^2-ncutL^2); %equ= real(cos(kb*b)-(i/2)*(ka/kb)*sin(kb*b))*exp(-i*ka*a)== -1; equ= real(cos(4.052*10^6*sqrt(1.5^2-ncutL^2)*0.305*10^-6)-(i/2)*((4.052*10^6*sqrt(2.0^2-ncutL^2))/(4.052*10^6*sqrt(1.5^2-ncutL^2)))*sin(4.052*10^6*sqrt(1.5^2-ncutL^2)*0.305*10^-6))*exp(-i*4.052*10^6*sqrt(2.0^2-ncutL^2)*0.211*10^-6)== -1; solex=solve(equ,ncutL)