# Math Help - Ti-84 Graphing Nint

1. ## Ti-84 Graphing Nint

While trying to graph NINT, I keep getting the wrong graph.

I'm trying to graph $\sqrt{ 1 + sin^2 x}$ on the interval [0,3].
I first got a straight line graphing:
fnint(the function, x, 0, 3)
Then I looked at my book and changed the x-res to increase speed.
Now the function looked like an line that is increasing.
fnint(the function, x, 0, x)

What should I do?
Thanks!

2. Originally Posted by Truthbetold
While trying to graph NINT, I keep getting the wrong graph.

(1) I'm trying to graph $\sqrt{ 1 + sin^2 x}$ on the interval [0,3].

I first got a straight line graphing:
(2) fnint(the function, x, 0, 3)
...
I don't know what went wrong:

to #1: I've attached the screenshots of the graph.

to #2: The command fnInt is used to calculate the integral

$\int_0^3 \sqrt{1+\sin^2(x)} dx$

which will yield one real number. See attachment.