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I have a TI 84 plus silver edition[/font]

I have a question.... I need to find the integral of tan(x)/Square root (1-(sinx)^2) from pie/3 to pie/4.... I typed it in my calculator with fnInt(tan(x)/root(1-sin(x)^2,x,(pie/4),(pie/3))

What am I doing wrong it keeps saying error?

Try adding a closing parenthesis, ), after ^2, like this: fnInt(tan(x)/root(1-sin(x)^2),x,pi/4,pi/3)