Example

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

Question

$$\frac { 1 } { A r _ { 15 } }$$

Evaluate

$\frac{1}{Ar_{15}}$

Differentiate w.r.t. A

$-\frac{1}{r_{15}A^{2}}$

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