How do I solve the following equations

Hello, everybody! I can`t solve these equations. Please, help me! Thanks...

x=a*sin(k*z)±W/2;

k=2π/λ, λ=10000, a=3000, W=500;

and

x=z*tan(θ)-d*cos(θ);

θ=π/6, d=0..100;