Example

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

Question

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

Evaluate

$-\left(y-2\right)^{2}-9x^{2}$

Differentiate w.r.t. x

$-18x$

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