Example

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

Question

$$x^{4}+9-7x^{2}+2xy-y^{2}$$

Evaluate

$x^{4}-7x^{2}+2xy-y^{2}+9$

Differentiate w.r.t. x

$2\left(2x^{3}-7x+y\right)$

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