Question
Integrate the function $\sqrt {4 - {x^2}} $
$ = \int {\sqrt {2^2 - {x^2}} dx} $
$= \frac{x}{2}\sqrt {{2^2} - {x^2}} + \frac{{{2^2}}}{2}{\sin ^{ - 1}}\frac{x}{2} + c$
$\left[ {\because \int {\sqrt {{a^2} - {x^2}} dx} } \right.$ $\left. { = \frac{x}{2}\sqrt {{a^2} - {x^2}} + \frac{{{a^2}}}{2}{{\sin }^{ - 1}}\frac{x}{a}} \right]$
$= \frac{x}{2}\sqrt {4 - {x^2}} + 2{\sin ^{ - 1}}\frac{x}{2} + c$
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