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$\sin^{-1}x$=
Difficulty: Easy
A: 
$\sin(\frac{\pi}{2}-x)$
B: 
$\sin^{-1}(\frac{\pi}{2}-x)$
C: 
$\frac{\pi}{2}-\cos^{-1}x$
D: 
$\frac{\pi}{2}+\cos^{-1}x$
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