Example

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

Question

$$\frac{ 4 }{ { x }^{ 2 } -1 }$$

Evaluate

$\frac{4}{x^{2}-1}$

Differentiate w.r.t. x

$-\frac{8x}{\left(x^{2}-1\right)^{2}}$

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