[BUG] Degrees on CAS

02252014, 10:12 AM
Post: #1




[BUG] Degrees on CAS
Context: CAS/Home in degrees
Test 1 Enter cos(90) in CAS just to check you get 0 and are indeed in degrees Test 2 Enter acos(cos(pi/2)) you get 90 Home returns 1.57 as expected. Test 3 Enter asin(sin(pi)) you get 0 Home returns 3.14 as expected 

02252014, 12:17 PM
Post: #2




RE: [BUG] Degrees on CAS
(02252014 10:12 AM)Tugdual Wrote: Context: CAS/Home in degrees I notice if you remove the tick for Exact in CAS settings, you get the same results as in Home Cheers, Terje 

02252014, 01:23 PM
Post: #3




RE: [BUG] Degrees on CAS
Well done Terje. I'll remember you shall not ask the Prime for an Exact result if you want the correct one. Huh what?


02252014, 01:51 PM
Post: #4




RE: [BUG] Degrees on CAS
(02252014 01:23 PM)Tugdual Wrote: Well done Terje. I'll remember you shall not ask the Prime for an Exact result if you want the correct one. Huh what? Given that "the number π is a mathematical constant that is the ratio of a circle's circumference to its diameter", it may not be too far fetched that the system treats π/2 as 90 in Exact mode? Maybe others have a clearer understanding/explanation for that? Cheers, Terje 

02252014, 05:56 PM
Post: #5




RE: [BUG] Degrees on CAS
Will be fixed with the next release. It was not found before because CAS users generally work in radian. And if you work in degree, there is no reason to enter something like cos(pi).


02252014, 07:32 PM
Post: #6




RE: [BUG] Degrees on CAS
(02252014 05:56 PM)parisse Wrote: Will be fixed with the next release. It was not found before because CAS users generally work in radian. And if you work in degree, there is no reason to enter something like cos(pi).Except when you test this asin(acos(atan(tan(cos(sin(9))))) and the result is asin(sin(9)1/2*pi+90) pi came on its own, I didn't pull it... and I started suspecting more. 

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