Question: I know this is a stupid mistake

I am currently working on a project with Maple, and I am stumped beyond belief. The first I have been working on for something like two weeks now. I have worked on it with the university computers, and my own computer and recieved the exact same error. I don't see any syntax errors, and apparently the TA has been able to get his to work. So could someone possibly point out my stupid mistake? f1:= (2*x(c-Pi/2))/sqrt(1-sin(c)); fint:= int(f1, x=0..1); limit(fint,c=(Pi/2), right); And it outputs the following: signum(int(2*x(0)*sqrt(2), x = 0 .. 1))*infinity This shouldn't be complicated at all. Define function, integrate from 0 to 1, then find the limit as a variable approaches pi/2. I am at my wit's end with this. As I have said, I have tried on multiple computers, I have made 5 worksheets now, and I can't see a single syntax error in there.
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