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Um, this is a drastic deviation from most opinions on this thread, but I think a scientific calculator should do just fine. I'm going to be using one, anyway. If you know the logic/rules/rationale behind graphs, you should be able to crack the questions. If not, plot a few points and make a rough sketch. Use hints like symmetry along y=x for inverse of a function and so forth. Most people I know have gotten 800s without a graphing calc at all. Of course, I do come from India...that might be a point there, we've never seen even a scientific calculator all our school careers.
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