Read the following information and answer the two items that follow :

Consider the equation x^y = e^{x $$-$$ y}

What is $${{{d^2}y} \over {d{x^2}}}$$ at x = 1 equal to ?

What is the derivative of $${\sec ^2}({\tan ^{ - 1}}x)$$ with respect to x ?

If f(x) = sin (cos x), then f'(x) is equal to

For the following three (03) items:
Let $y=f(x)=\frac{x\sin ^{-1}x}{\sqrt{1-x^{2}}}+\ln \sqrt{1-x^{2}}.$

What is $\frac{d^{2}y}{dx^{2}}$ at x = 0 equal to?