# Feynman Trick

## #Integration

An identity about integral

The following identity is true,

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

Modified:
by Lei Ma;

## Table of Contents

**Current Ref:**

- til/math/feynman-tricks.md

An identity about integral

The following identity is true,

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

Modified:
by Lei Ma;

**Current Ref:**

- til/math/feynman-tricks.md