I'm a little frustrated because in my class we never used calculators, and now I have to prepare for a state math test that requires extensive calculator usage. I'm using the TI-83 Plus... My review book says to graph 2sinx+cos2x in Y1 and 2sin^2x-1 in Y2 and observe their solutions (x-coordinates of intersection points) (1.57, 3.67, 5.76).

Every time I graph these I go put the cursor on where I see them intersect and they never intersect at these points. I think I am not entering the second graph in correctly... I am entering it in as 2sin(x-1)^2.

Also, any tips about graphing in general would be great since I am nearly a complete noob with graphing calculators. Help is appreciated.