Inaccuracy of TAN near 75° in rad mode
06-30-2015, 08:28 PM
Post: #19
 Dieter Senior Member Posts: 2,397 Joined: Dec 2013
RE: [WP 34s] Innacuracy of TAN near 75° in rad mode
(06-30-2015 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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 Messages In This Thread Inaccuracy of TAN near 75° in rad mode - Marcio - 06-30-2015, 03:18 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Gerald H - 06-30-2015, 06:22 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Gerald H - 06-30-2015, 06:34 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Gerald H - 06-30-2015, 06:59 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Marcio - 06-30-2015, 07:03 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Gerald H - 06-30-2015, 07:04 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Marcio - 06-30-2015, 07:15 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Jake Schwartz - 06-30-2015, 07:39 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Gerald H - 06-30-2015, 07:18 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Gerald H - 06-30-2015, 07:20 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Gerald H - 06-30-2015, 07:26 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Marcio - 06-30-2015, 07:33 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Gerald H - 06-30-2015, 07:37 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Gerald H - 06-30-2015, 07:41 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Dieter - 06-30-2015, 07:41 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Marcio - 06-30-2015, 07:49 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Dieter - 06-30-2015 08:28 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Dieter - 06-30-2015, 08:06 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Marcio - 06-30-2015, 08:11 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - Dieter - 06-30-2015, 08:45 PM RE: [WP 34s] Innacuracy of TAN near 75° in rad mode - BarryMead - 06-30-2015, 08:58 PM RE: Innacuracy of TAN near 75° in rad mode - Marcio - 07-01-2015, 01:41 AM RE: Inaccuracy of TAN near 75° in rad mode - Dieter - 07-01-2015, 06:36 PM

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