Prime oddity and 39gii

[lrdheat]

Tim W and group...on the Prime in CAS, the integral from 0 to 4 of surd(2*x,3) brings up a message after which alternate solutions of [3 6.00000087595] are presented. 6 is the correct answer. In home, the same integral produces Error: infinity result. In plot mode, area under the curve from 0 to 4 produces "undefined".

On the 39gii, with the function to be integrated entered as (2*x)^(1/3) produces exactly 6. When the function is entered as 3 root (2*x), it produces ER: Invalid input. In plot mode, the area under the curve produces 4.03774125641.

All done on physical devices with latest firmware.

In the classroom, this would produce confusion. Students might not recognize that 4+ is incorrect! For me, lack of confidence (I would prefer an error message over an incorrect result).