Answer
$x = 0$
Work Step by Step
$sin^{-1}~x-tan^{-1}~1 = -\frac{\pi}{4}$
$sin^{-1}~x-\frac{\pi}{4} = -\frac{\pi}{4}$
$sin^{-1}~x = 0$
$x = sin~0$
$x = 0$
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