Re: Trigonometrics on the 17bii+ Message #9 Posted by Les Wright on 4 Mar 2007, 9:44 p.m., in response to message #4 by Gerson W. Barbosa
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This still can be improved by someone who knows the HP17BII/II+ solver better, like placing SIN, COS and TAN into a single menu group
I think this can be done, but it looks like it can get complicated when the equations themselves are "busy". Probably need to work it out on paper first, then enter it in.
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I am curious if they work on the HP17BII+.
I have entered only the SIN equation from set 1, and it works beautifully. Very fast. Solving for arcsine iteratively takes a couple of seconds and requires an intelligent initial guess lest one get a result outside of the 90 to +90 degree range that may not be trustworthy. Of note, naively solving for arcsin(1) from initial guesses of 85 degrees converges not to 90 degrees but rather 89.9998857789, which is expected since the sine of the latter is very close indeed to 10.999999999998 on my HP49G+.
This is a lot of typing and I am very interested in learning more about the Solver and combining these into one omnibus equation that reuses the repeated polynomial material with the L() and G() commands. It would be nice to have all of this stuff in one solver menu, but this means it all needs to be in one huge equation with conditionals built in. Complicated!
Les
