[Bug or Suggestion]About HP Prime G1 New Beta Firmware

[yangyongkang]

In the process of using, I have encountered more troublesome indefinite points.
(i)

Code:

∫(e^atan(x)/(sqrt(x^2+1))/(1+x^2),x)

Hp prime can't be solved directly, but through the following variant

Code:

subst(∫(e^atan(x)/(sqrt(x^2+1))/(1+x^2),x),x=tan(t))

In the old version of the firmware can be solved
But the new firmware can't be solved

(ii)

Code:

int(1/sqrt(x^3-x),x)

Code:

∫(1/(1+x^4)^(5/4))

(iii)

Code:

∫(x*e^x/(sqrt(e^x-1)),x)

Hp prime can't be solved directly, but through the following variant

Code:

subst(∫((e^x*sqrt(e^x-1)*x)/(e^x-1),x),equal(x,ln(t^2+1)))

get

Code:

2*t*ln(t^2+1)*sign(t)-4*t*sign(t)+4*atan(t)*sign(t)