Example

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

Question

$$\frac { 19 } { \sqrt { 20 } + 1 } + 4 - 2 \sqrt { 5 } n$$

Evaluate

$-2\sqrt{5}n+2\sqrt{5}+3$

Differentiate w.r.t. n

$-2\sqrt{5}$

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