i don't understand
#1

ok, i'm just starting with this calculator, and still learning a lot (i just acquired the hp 33s). i'm trying to do this:

in DEG mode:

9 sin cos tan atan acos asin = 8.99999986001

in RAD mode:

9 ->RAD sin cos tan atan acos asin ->DEG = 9.00000000009

9 pi x 180 / sin cos tan atan acos asin 180 x pi / = 9.00000000009

does that mean RAD mode is more accurate?

thanks for the comments!

#2

While the first step (sin) is numerically equivalent to the degrees calculation, the input angle for second step (cos) is equivalent to approximately 8.96303461718 degrees (compaired to 0.15643446504 degrees in the "degree mode" evaluation of the algorithm). Except for the first and last steps, the actual magnitude of the angles in radians for the intermediate steps are much larger than they are in "degree mode," and the algorithms used to calculate the trigonometric functions are much better behaved with those larger angles.



Possibly Related Threads…
Thread Author Replies Views Last Post
  Another Prime mystery - templates don't work anymore Michael de Estrada 2 1,306 11-02-2013, 11:34 AM
Last Post: Michael de Estrada
  Prime Updates (don't get excited yet) Tim Wessman 3 1,474 09-26-2013, 06:18 PM
Last Post: Han
  Warning - Don't update RPN-67 Pro on your iPad Michael de Estrada 9 2,671 05-02-2013, 03:21 PM
Last Post: BShoring
  wp34s crystal kits -- don't worry David Griffith 7 2,066 04-16-2012, 04:58 PM
Last Post: Marcus von Cube, Germany
  OT: To All Number Crunchers: Don't miss this VBA numeric library Namir 0 786 04-04-2012, 11:25 AM
Last Post: Namir
  WP 34s: Trying to understand SLV Miguel Toro 31 7,219 10-23-2011, 03:55 PM
Last Post: Miguel Toro
  (sigh) I don't understand (TAS revisited) Jim Johnson 10 2,662 09-22-2011, 07:22 PM
Last Post: Steve Leibson
  I do not understand :-) robertoataulfo 11 2,748 09-10-2011, 05:05 PM
Last Post: Håkan Thörngren
  OT: I would like to understand robertoataulfo 5 1,603 08-19-2011, 05:00 PM
Last Post: Walter B
  I don't understand why anyone would need this Michael de Estrada 3 1,281 06-21-2011, 02:59 PM
Last Post: Michael de Estrada

Forum Jump: