At what points do curves $r_1(t)=($:$t,1-t,3+t^2$:$)$ and $r_0(s)=(3-s,s-2,s^2)$ intersect? Find angle

$39.$ to nearest degree

${\displaystyle \underset{0}{\overset{1}{}}}(\frac{1}{t+1}i+\frac{1}{t^2+1}j+\frac{t}{t^2+1}k)dt$

Find $r(t)$

$43$ if $r^{\text{'}}(t)=2ti+3^{2}j+\sqrt[\phantom{2}]{t}k$ and $r(1)=i+j$

Can i please have help with numbers $39$ and $43.$ Please and thank you for your time!