Error when integrating absolute value

[LCieParagon]

(12-06-2019 08:11 PM)parisse Wrote:  I guess you mean int(k*abs(cos(x)),x,-pi/2,3*pi/2);
There is a warning displayed in the terminal. If you compute the integral without k, the calculator can check the discontinuities of the antiderivative, but not with k, the check is disabled because checking for more complex inputs could raise endless computations.
This input is simple, it's certainly possible to solve this case, but at some point you will find a similar error, whatever I code.

Sure, but there are no discontinuities of cosine and all values are real.

And in the other problem I showed above, it's purely numeric and it's providing me with an incorrect answer. I should be getting 9 and I'm getting 3. You could see the other reply as well.