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when I run those commands in mathematica:

y[x_,A_]:=Sin[x]+A+5

Plot[{y[x,5],y[x,6]},{x,0,5}]

z[x_]:=D[y,x]

Everything seems to go well.

But when I trie to plot the derivative:

Plot[{y[x,5],z[x]},{x,0,5}]

I allways have these errors:

Plot::plnrz[x] is not a machine-size real number at x= 2.0833333333333333`*^-7

....

What am I doing wrong ?

I allready tried to change the arguments of z[] to z[x,4], z[x,A] etc...

There's nothing about plotting derivatives on the quick tutorial.

Any help is really appreciated.

I uploaded my mathematica file here http://s47.yousendit.com/d.aspx?id=0LG6F35A7OTY2SVEC7L1T6GXA

Thanks in advance

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# Mathematica question - Beginner.

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