Integral crash

[Albert Chan]

∫(sec(x), x = 0 .. pi/6) = gd^-1(pi/6) = asinh(tan(pi/6)) ≈ 0.549306

However, when I try to "fold" it, XCas crashes.

XCas> 2*cos(pi/12)* ∫(cos(pi/12-x) / (cos(x)*cos(pi/6-x)), x = 0 .. pi/12)

Tested on XCas 1.9.0-22 (win32)      → CRASH

Interestingly, XCas 1.5.0-63 (win32) (old version), does not have problem with this.

I wonder if latest HP Prime, with code based from XCas, will fail too ...