The derivative of $y = \sin^{-1} x + \sqrt{1-x^2}$ can be found by taking the derivative of each term separately.
$\frac{dy}{dx} = \frac{d}{dx}(\sin^{-1} x) + \frac{d}{dx}(\sqrt{1-x^2})$
Using the chain rule for the first term and the power rule for the second
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