Re: HP 15C Displaying Incorrect Values! Message #7 Posted by Jeff O. on 20 Apr 2011, 7:41 a.m., in response to message #5 by Ian McParland
Please don't take offense, but are you absolutely, positively sure that you did not take ln(3/2)?
Regarding complex mode, like Eric said it is a mode that accepts complex numbers as arguments to functions, and returns complex numbers when appropriate. It is activated on the 15C by setting flag 8 (g SF 8), or by pressing f I. When active, it creates a parallel, unseen stack which holds the imaginary components of complex numbers. The real portions are held in the regular viewable stack. A small "c" appears in the lower right of the screen when in complex mode. The biggest potential gotcha is that all arguments are treated as radians for trigonometric functions when in complex mode, regardless of the angular mode setting of the calculator. So in complex mode, sin(60) will return -0.3048 instead of 0.8660.
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Edited: 20 Apr 2011, 7:42 a.m.
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