Having troubles getting this derivative

[bmed90]

Homework Statement

find dx/dt and dy/dt

Homework Equations

x= sin(t)-tcos(t)

y=cos(t)+tsin(t)

The Attempt at a Solution

dx/dt= cos(t)-(-tsin(t)) = cos(t)+tsint

dy/dt=-sin(t)+tcost

 

[hadsed]

You're forgetting a minor detail. Recall the rules for differentiation, particularly products.