# Homework Help: Multivariable Calculus - Tangent Line

1. Sep 19, 2010

### Larrytsai

1. The problem statement, all variables and given/known data
Find parametric equations for the tangent line at the point
(cos (-5*pi/6), sin (-5*pi/6), -5*pi/6) on the curve
x(t) = cos t
y(t) = sin t
z(t) = t

(Your line should be parametrized so that it passes through the given point at t=0).

Im not really understanding the question that well, can anyone help me understand and solve this problem?

2. Relevant equations

3. The attempt at a solution
What I have so far is,

r'(t) = ( - sin t , cos t, 1)
so
x(t) = -sin t + cos(-5pi/6)
thats all I have so far and its wrong.

Last edited: Sep 19, 2010