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$\sin[\frac{\pi}{2}-\sin^{-1}(\frac{-\sqrt{3}}{2})]$=
Difficulty: Easy
A: 
1/2
B: 
$\frac{-\sqrt{3}}{2}$
C: 
$\frac{1}{\sqrt{2}}$
D: 
$\frac{-1}{\sqrt{2}}$
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