The curves vec$(r{)}_1(t)=($:$-4t,t^6,t^2$:$)$ and vec$(r{)}_2(t)=($:$sin(t),sin(-5t),t-$:$)$ intersect $at$ the

origin.

Find the angle $of$ intersection, $in$ radians $on$ the domain $0t,to$ two decimal places.