### Extract between parentheses

Extracts between parentheses - parentheses may be nested
Test data
Wind energy is the kinetic energy of air in motion, also called wind. Total wind energy flowing through an imaginary surface with area A during the time t is:
{\displaystyle E={\frac {1}{2}}mv^{2}={\frac {1}{2}}(Avt\rho )v^{2}={\fra...

Submitted by anonymous - 7 years ago