# Feynman Trick

An identity about integral

The following identity is true,

$$ \frac{1}{AB} = \int_0^1 \frac{1}{[A + (B - A) x ]^2} dx . $$

Last tended:
by Lei Ma;

L Ma (2015). 'Feynman Trick', Datumorphism, 02 April. Available at: https://datumorphism.leima.is/til/math/feynman-tricks/.