- #1
Dassinia
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Hello !
Consider a parametrized curve
C(θ)=( (R+r)*cos(θ) - d*cos(θ(R+r)/r) ; (R+r)*sin(θ) - d*sin(θ(R+r)/r) )
Show that C is regular for d<r. Is it regular if d=r ?
C'(θ)=( -(R+r)*sin(θ) +d*(R+r)/r*sin(θ(R+r)/r) ; (R+r)*cos(θ) - d*(R+r)/r*cos(θ(R+r)/r) )
I don't know how to show that it is regular for d<r, i am supposed to show that C'(θ)≠0 but I don't know how to introduce the condition to prove that
Thanks
Homework Statement
Consider a parametrized curve
C(θ)=( (R+r)*cos(θ) - d*cos(θ(R+r)/r) ; (R+r)*sin(θ) - d*sin(θ(R+r)/r) )
Show that C is regular for d<r. Is it regular if d=r ?
Homework Equations
The Attempt at a Solution
C'(θ)=( -(R+r)*sin(θ) +d*(R+r)/r*sin(θ(R+r)/r) ; (R+r)*cos(θ) - d*(R+r)/r*cos(θ(R+r)/r) )
I don't know how to show that it is regular for d<r, i am supposed to show that C'(θ)≠0 but I don't know how to introduce the condition to prove that
Thanks