Try to enter "csc(x)^3" in "function", and let variable to be "x"
Click all steps, and watch the system freezes.
Or yo can click "Next Step", which won't change the integrand at all, you may click 100000000 times -- the program is in an infinite loop.
It does not change the integrand either.
"Partialfraction" rule is not integrated in the interface.
"Rewrite" rule does not check whether the equation holds.
Sometimes the application freezes with no apparant reason, and it's hard to identify what causes it.