Inaccuracy of TAN near 75° in rad mode

06302015, 08:28 PM
Post: #19




RE: [WP 34s] Innacuracy of TAN near 75° in rad mode
(06302015 07:49 PM)Marcio Wrote: I should also point out that the problem only rises (more significantly) when the angle is between 73 and 77 degrees. There must be a reason for that. No, there is nothing special about 73, 75 or 77 degrees. The error gets larger as the angle approaches 90° and, here more important, if the angle in radians happens to round not very well to 12 digits. Example: tan 75,2° = 3,7848 48088 37 75,2° = 1,3124 87597 49973... radians, which rounds nicely to 12 or even 11 digits. tan(1,3124 87597 50) = 3,7848 48088 37 q.e.d. Dieter 

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