Integral Help

[skiesofgrey]

I got this problem for my midterm review and I honestly have no idea of how to go about it. If someone could lend me their wisdom, that would be greatly appreciated :')

-∫ (4x + 8) csc²(x² + 4x - 15) e^{cot(x2 + 4x - 15)} dx

 

[Steven G]

Let u = cot(x² + 4x - 15)

 

[Harry_the_cat]

Note that 4x+8 is 2 times the derivative of x^2+4x-15.