Need Mathematic Help

[dmw16]

I am trying to take derivatives and integrals in mathematic, which I've never used before (but matlab sucks at symbolic integration).

Anyway, let's say I have this function:

2*cos(Pi*X)

(it is far more complex, but for an example it works)

I enter...

Integrate[2*cos[Pi*X],X]

Then right click and "Evaluate Cells"

It returns (I'll use "S" for the integral sign)

2 * S cos[Pi*X]dx

That does me no good. I've tried giving it values to do a definite integral with the same results.

When I take the derivative I enter:

D[2*cos[Pi*X],X]

It returns

2*Pi*cos'[x*Pi]

again...DUH!

How do I get it to actually do the integration and derivative?

Thanks.

 

[nccr]

Try Cos instead of cos.

 

[dmw16]

Originally posted by: nccr
Try Cos instead of cos.

Good GOD! I hate you mathematica!

THanks for the help.