I'm going to give my even answers so far just to compare and see if everyone else is getting the same. Some are a little weird in my opinion. I used a calculator on a few too. -By the way, go here and make sure your preferences are set right so it makes these easier to read. $ #38 = \pi $ $ #48 = x - \arctan{x} + c $ $ #50 = -22.578 $ $ #56 = = \pi/4 + \ln{2} $