MATLAB Exercise $4$:

Use ezplot to plot cos$($x$)$ from $-2\backslash$pi to $+2\backslash$pi $.$ Don't define an

expression for cos$($x$)$; just enter it into ezplot as a character string:

ezplot$(\text{'}$cos$($x$)\text{'})$

Use ezplot to create an implicit plot of x$^(2)-$y$^(4)=5.$

Usc ezplot to plot sin$($x$)$ and cos$($x$)$ on the same graph. Use the

interactive plotting tools to change the color of the sine graph.

Had some code but it would not give me an output. Looking for help. MATLAB