What do I have to do
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If you add a zero to the ones place to level the numbers out it should look like this 
and count the numbers from 0.325 to 0.350
You have to know that the graph of the arctangent function is a flat S-shaped curve that goes through (0, 0) and has asymptotes at ±π/2. The factor of 2 that multiplies it here expands it vertically so the asymptotes are at ±π. The +3 added to the x causes it to be shifted to the left by 3 units.
