The directions say, The helix r1(t) intersects the curve r2(t) at the point (1,0,0). Find the angle of intersection of these curves. Well here is my work, and i'm stuck, how am i suppose to find the dot product of these 2 vectors once i take the derivative? the sin(1) is not a pretty number, and the book gets an asnwer of Pi/2 i think. What did i do wrong? Thanks.(adsbygoogle = window.adsbygoogle || []).push({});

Work:

http://show.imagehosting.us/show/799218/0/nouser_799/T0_-1_799218.jpg

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Finding the angle between 2 vectors problems!

**Physics Forums | Science Articles, Homework Help, Discussion**