Question

The curves
r1(t) = 5t, t^2, t^4
&
r2(t) =sin t, sin 4t, 3t

intersect at the origin. Find their angle of intersection, θ, correct to the nearest degree.

Answer 1

funny how much time google can save you

http://www.math.ucla.edu/~ronmiech/Calculus_Problems/32A/chap11/section7/732d51/732_51.html