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+ - Cheap second calculators for tests

Submitted by Rich0
Rich0 (548339) writes "I own an HP 48 calculator that I'm quite content with, but soon I'll need to take a certification exam where this calculator will not be welcome. I'm sure this is a common problem for those who own higher-end calculators. Sure, I could just buy a random $15 calculator with a few trig functions, but I was wondering who makes the best moderately-priced calculators for somebody who already has and appreciates a programmable calculator and just needs something simple. Bonus points if the calculator can handle polar vector arithmetic and unit conversions, but it has to be simple enough that virtually any exam would accept its use."
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Cheap second calculators for tests

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Every nonzero finite dimensional inner product space has an orthonormal basis. It makes sense, when you don't think about it.

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