Example

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

Question

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

Evaluate

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

Differentiate w.r.t. x

$18x$

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