Using a Graphing calculator to verify Trig Eqautions in radian mode

Okay so in one of my previous posts I had to solve Trig. Equations between [0,2PI), to get all solutions and giving exact answers. Another part to the assignment was to check the answers for each radian measure on my calculator and then graph it. I know to check each function you have to plug in the equation and then use the TABLE setting to compare answers, I'm just a bit confused on the graphing aspect of it.

Here is one of my problems with its solutions in exact answers:

Problem : 5 Sin ^ 2 x - 8 sin x = -3

The answer for the left side is 3 / 5 with no radian solution

The answer for the right is Sin x = 1 and -1

Its radian mesaures are: PI/2 and 3PI/2