Question
Using the standard formulae, expand:
$\left(\frac{3 a}{2 b}-\frac{2 b}{3 a}\right)^2$
$\left(\frac{3 a}{2 b}-\frac{2 b}{3 a}\right)^2$
✓
Answer
$\frac{9 a^4}{4 b^2}+\frac{4 b^2}{9 a^2}-2$
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