Trigonometric reduction formulas
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03-24-2020, 04:30 PM
Post: #6
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RE: Trigonometric reduction formulas
(03-23-2020 03:47 PM)parisse Wrote: cot is not a fundemental trigonometric function inside the CAS, it will always be rewritten with sin and cos. I'm not asking for cot to be given as an answer. It just seems strange that texpand acting on \(\tan(a-b)\) returns \((\tan a -\tan b)/(1+\tan a\tan b)\), but acting on \(\tan((\pi/2)-b)\) texpand returns "undef". This expression is perfectly well-defined. Returning either \(\cos x/\sin x\), \(1/\tan x\), or even the original expression unchanged would be better than "undef". I appreciate that it is not possible for a CAS - especially on a calculator - to consider every special case in every situation, so I do understand if things are left as they are. Nigel (UK) |
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Messages In This Thread |
Trigonometric reduction formulas - Jan 11 - 03-21-2020, 02:45 PM
RE: Trigonometric reduction formulas - parisse - 03-22-2020, 01:48 PM
RE: Trigonometric reduction formulas - Jan 11 - 03-23-2020, 04:53 AM
RE: Trigonometric reduction formulas - Nigel (UK) - 03-23-2020, 03:46 PM
RE: Trigonometric reduction formulas - parisse - 03-23-2020, 03:47 PM
RE: Trigonometric reduction formulas - Nigel (UK) - 03-24-2020 04:30 PM
RE: Trigonometric reduction formulas - parisse - 03-24-2020, 07:13 PM
RE: Trigonometric reduction formulas - parisse - 03-25-2020, 07:39 AM
RE: Trigonometric reduction formulas - CyberAngel - 03-25-2020, 04:03 PM
RE: Trigonometric reduction formulas - Jan 11 - 03-25-2020, 08:07 AM
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