The function $$f(x)=\log (1+x)-\frac{2 x}{2+x}$$ is increasing on

If $$A=\left[\begin{array}{lll}0 & 1 & 2 \\ 1 & 2 & 3 \\ 3 & 1 & 1\end{array}\right]$$, then $$A^{-1}=$$

The equation of circle with centre at $$(2,-3)$$ and the circumference $$10 \pi$$ units is

If y = 2 sin x + 3 cos x and y + A$$\mathrm{\frac{d^2y}{dx^2}}$$ = B, then the values of A, B are respectively