How to plot cos(x)^4/(1-0.5cos(x))^6 between 0 and 90 degrees

Have attempted this but gives error regarding matrices, could someone tell me the error in my code? Did it in one line at y = , but gives y as single value so can't be plotted.

 x = (0:1:90)
 a = cos(x).^4
 b = (1-0.5*cos(x)).^6
 y = a/b
 plot(x,y,'k+-')

Answer 1

[Birdman]

You need to do elementwise operation. Try this:

x=0:0.01:pi/2;
y=cos(x).^4./(1-0.5*cos(x)).^6;
plot(180*x/pi,y)

[Blair Perella]

Yeah that sorted it, thanks!