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I will write out my problem

Given an Electric Field
{4 cos(6*10^8 t- 2z), 3 sin(6*10^8-2z)}
Find associated Magnetic Field

using the formula
\[H=\frac{1}{j \omega \epsilon} \nabla x E\]

so we find phaser
\[<4 e^{-2zj},-j3e^{-2zj}>\]

of course we are only taking the real component

so we have to find the curl of that

x component
\[\partial /\partial y()- \partial/\partial z(y component)\]