Example

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

Question

$$1+a^{2}-9b^{2}$$

Evaluate

$a^{2}-9b^{2}+1$

Differentiate w.r.t. a

$2a$

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