Example

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

Question

$$f(x)= \sqrt{ 1- { x }^{ 2 } }$$

Evaluate

$\sqrt{1-x^{2}}$

Factor

$\sqrt{-x-1}\sqrt{x-1}$

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