Example

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

Question

$$p ^ { 2 } + q ^ { 2 } - r ^ { 2 }$$

Evaluate

$p^{2}+q^{2}-r^{2}$

Differentiate w.r.t. p

$2p$

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