Question
Expand:$ \left(x^2 y-y z^2\right)^2 $
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Answer
$ \left(x^2 y-y z^2\right)^2 $
$ \left(x^2 y\right)^2-2 \times x^2 y \times y z^2+\left(y z^2\right)^2 $
$ =x^4 y^2-2 x^2 y^2 z^2+y^2 z^4 $
$ \left(x^2 y\right)^2-2 \times x^2 y \times y z^2+\left(y z^2\right)^2 $
$ =x^4 y^2-2 x^2 y^2 z^2+y^2 z^4 $
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