Timeline for Checking if two trigonometric expressions are equal
Current License: CC BY-SA 3.0
11 events
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| Jul 1, 2012 at 6:13 | history | edited | Mr.Wizard | CC BY-SA 3.0 |
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| Jun 29, 2012 at 17:58 | comment | added | Searke | Yes. I get it. The purpose of explaining it this way was to present a general method instead of presenting 6 different cases. Thanks. | |
| Jun 29, 2012 at 13:50 | comment | added | Artes |
Sin[x] === Tan[x] Cos[x] yields True, while Sin[x] != Tan[x] Cos[x] returns False, also Sin[x] - Tan[x] Cos[x] yields 0. No need neither for PossibleZeroQ, FindInstance, nor FullSimplify.
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| Jun 29, 2012 at 13:35 | history | edited | Artes | CC BY-SA 3.0 |
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| Jun 26, 2012 at 15:32 | comment | added | Artes |
Try Sin[x] == Tan[x] Cos[x] without FullSimplify, it returns True because of built-in rewrite rules, so your example is completely inadequate.
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| Jun 26, 2012 at 14:53 | comment | added | Searke | Oh I most certainly didn't mean to imply that. It's simply just useful in these kinds of cases. Like PossibleZeroQ, its results don't really guarantee anything. | |
| Jun 26, 2012 at 13:53 | comment | added | Artes |
If FindInstance[expr1[x] != expr2[x], x] doesn't yields any answer it doesn't mean that expr1[x] == expr2[x] !!!!!
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| Jun 26, 2012 at 13:31 | comment | added | stupidity | Great!! FullySimplify worked just well. And my answer is correct :D Thank you a lot! | |
| Jun 26, 2012 at 13:30 | vote | accept | stupidity | ||
| Jun 26, 2012 at 13:22 | history | edited | Searke | CC BY-SA 3.0 |
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| Jun 26, 2012 at 13:16 | history | answered | Searke | CC BY-SA 3.0 |