-3

I have the line integral problem $q(x,y,z)=\frac{yx^5}{81}$ for $x=3\cos(t)$, $y=3\sin(t)$, $z=3\tan(t)$ from $0\le t\le \pi/2$.
My working so far is:
My sticking point is that no matter how I sub in trig identities for sec^4(t) or u-substitute, I cannot find an integratable function. Am I mis...