From the above plot I get 0 for x=-3 and x=-5, yet the value of f(-3) and f(-5) are not even close.
The above deff is from lecture 14, and I was just trying to plot this function on an interval to get an idea of where the zeroes were.
So how should the plot function be written?
this should have been
deff('[y]=f(x)','y=2*sin(x)-((%e^x)/4)-1') and f(-3)=-1.294 and f(-5)=0.916
but still you can see a problem between the graph and the function results