Example

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

Question

$$d^{2}-2a+2b-b^{2}$$

Evaluate

$d^{2}+2b-b^{2}-2a$

Differentiate w.r.t. d

$2d$

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