Example

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

Question

$$a^{2}-12b-45$$

Evaluate

$a^{2}-12b-45$

Differentiate w.r.t. a

$2a$

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