Calculating the Trochoid Curve with Parametric Equations for d < r

[nameVoid]

x=rT-dsinT
y=r-dcosT
trochoid for d<r
integrating this on 0,2pi = 4x[0,pi/2] I am getting 2r^2pi-8rd+d^2pi text is just showing 2r^2pi+d^2pi

 

[LCKurtz]

x=rT-dsinT
y=r-dcosT
trochoid for d<r
integrating this on 0,2pi = 4x[0,pi/2] I am getting 2r^2pi-8rd+d^2pi text is just showing 2r^2pi+d^2pi

Integrating what? Tell us what you are trying to calculate.

 

[nameVoid]

area

 

[Cyosis]

Do you expect us to spend time on your problems when you don't bother putting any effort into your problem statement?

How do you expect us to point out your mistake if you don't even bother to write down the integral, including steps, you tried to compute.