(trick) working with hours, minutes, seconds

[Joe Horn]

(02-23-2014 05:36 PM)rprosperi Wrote:  How does one convert a CAS symbolic result to numeric (sorta like RPL's ->NUM)?

Example: (CAS Exact setting ON) I was following another thread comparing machine accuracy, and in CAS mode did asin(acos(atan(tan(cos(sin(9))))) which gives a symbolic result (not worth typing here, presumably correct) ...

It isn't correct, and that's the problem. It gets confused and returns a result with a mixture of degrees and radians: ASIN(SIN(9)-pi/2+90) [the exact form will depend on your simplification setting], which is the arcsine of 88 something. Gimme a B! Gimme a U! Gimme a G! Yay team!

Quote:... so I then pressed [a b/c] hoping to see the numeric value...

That's the correct thing to do, if the symbolic on level 1 can be evaluated. The one you had couldn't be evaluated, hence the error.

In your case, just drop the wrong answer and THEN press [a b/c] to approximate the original expression.