# angel of intersection between curves in 3D

• October 29th 2009, 09:01 PM
violet8804
angel of intersection between curves in 3D
Ok, the question's like this...

The curves r1(t)=<t,t^2,t^3> and r2(t)=<sin t, sin 2t, t> intersect at the origin. Find their angle of intersection correct to the nearest degree.

Thank you so much!
• October 30th 2009, 05:05 AM
HallsofIvy
Quote:

Originally Posted by violet8804
Ok, the question's like this...

The curves r1(t)=<t,t^2,t^3> and r2(t)=<sin t, sin 2t, t> intersect at the origin. Find their angle of intersection correct to the nearest degree.

Then use $tan(\theta- \phi)= \frac{tan(\theta)- tan(\phi)}{1+ tan(\theta)tan(\phi)}$.