Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$(x^{2}-2y)^{2}-(1-2y)^{2}$$

Evaluate

$\left(x^{2}-1\right)\left(x^{2}-4y+1\right)$

Expand

$x^{4}-4yx^{2}+4y-1$

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