Title: Very good, but still not good as the old ones
Product review: This is probably the best scientific calculator avaliable new today. But it is not as good as the older HP calculators, such as for example, HP-42s. It is of course much better than 33S, but is still missing matrix algebra an a better way to work with complex numbers. In 42s, for example, to take the square root of -1 is just type 1 +/- and sqrt key. I also prefer the old system of alpha, i.e., ABCDE, FGHI, etc, menus. 42s worked even with complex matrices and 35S does not work even with simple matrices. The only thing better than 42s is the batteries and the equation editor. And I wished it was smaller. Also missing a decent printed manual. Algebraic model sucks. I don't want to make "sin(30)" by doing "sin 30 =" even in algebraic mode. I had one, and gave it together with my 33S as part of the payment of my present day 42S, but despite of all, I will buy another soon.
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