CUET Mathematics 2023 7 June Shift 1 PYQs

If $t = e^{2x}$ and $\log_e t^2$, then $\frac{d^2y}{dx^2}$ is :

If $(x+ 1) e^y = 1$ , then :

If $y = \frac{\log x}{x^2}$, then $\frac{d^2y}{dx^2}$ is equal to