[BUG] - θ not displayed properly on CAS screen

[Han]

(12-27-2013 06:43 PM)Matt Wrote:  

(12-27-2013 06:36 PM)Han Wrote:  They can all be used as a CAS variable. For most CAS commands, \( x \) is the default variable where appropriate. The diff() command assumes \( x \) as the default variable of differentiation. However, diff(SIN(t),t) will work just fine (provided the variable \( t \) is used as part of the input).

Do you mean diff(SIN(t),t)?
diff(SIN(t)) doesn't work - it returns 0.

diff(SIN(t)) assumes that the input variable is \( x \), so that \( sin(t) \) is just a constant (with respect to \(x\) ). The derivative is correct once you understand how diff() works when not all arguments are explicitly passed. On the other hand, diff(SIN(t),t) gives COS(t).