Bug with LineTan

01012016, 10:38 PM
(This post was last modified: 01022016 10:47 AM by quinyu.)
Post: #1




Bug with LineTan
Using software 2015617 (8151), HW ver C, CAS 1.1.211, OS 0.037.526;
2. The previous expression, but with pi, or x,pi creates "Error: Bad Argument Value". Which is weird since the sine function clearly has a tangent at x=pi. If I want to get the equation, then f'(pi)*(xpi)+f(pi)=(1)*(xpi)+0. Thus the tangent has the equation L(x)=pix at x=pi. 

01022016, 07:57 AM
Post: #2




RE: Two bugs with LineTan
equation( LineTan sin(t),t=pi/4 )
Note that LineTan uses TI convention, i.e. should be enter without parenthesis: there is no bug here, the title should be modified:) 

01022016, 10:41 AM
(This post was last modified: 01022016 10:44 AM by quinyu.)
Post: #3




Bug with LineTan
I did not know about the "no parentheses" rule. When clicking on the toolbox, the parenthesised one is added to the entry line. My bad. And even the CAS reapplies the parentheses when I enter such line ( equation(LineTan sin(x),0) comes back as equation(LineTan(sin(x),0)) )... confusing, to say the least.
All the same, equation(LineTan Sin(x),pi) still returns an error, even though (as shown above) the function does have a tangent at the place with a proper form. equation(LineTan Cos(x),pi) works. Many other fractions/multiples of pi also work and deliver the proper tangent equation. I might be doing something wrong, or the CAS does. 

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