Hi all(adsbygoogle = window.adsbygoogle || []).push({});

I am trying to solve for an integral whose integrand is a derivative that has a change of variable inside of it.

∫ (dz/dx) * cos(θ) dθ between 0 and pi.

I have a function for z(x), and also know the relation between of x and θ, but what I don't know is how to evaluate such differential-integral operation numerically with the required change of variable.

x = c/2*(1-cos(θ) )

dz/dx = dz/dθ * dθ/dx...... how can I evaluate that derivative NUMERICALLY in terms of θ ??

thanks in advance

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

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!

# Numerical differentiation with change of variable

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