If x = f(t) and y = g(t) are differentiable functions of t then \(\rm\dfrac{d^2y}{dx^2}\) is
1
\(\rm \dfrac{f'(t) \cdot g''(t)-g'(t)\cdot f''(t)}{[f'(t)]^3}\)
2
\(\rm \dfrac{f'(t)\cdot g''(t)-g'(t)\cdot f''(t)}{[f'(t)]^2}\)
3
\(\rm \dfrac{g'(t)\cdot f''(t)-f'(t)\cdot g''(t)}{[f'(t)]^3}\)
4
\(\rm \dfrac{g'(t)\cdot f''(t)+f'(t)\cdot g''(t)}{[f'(t)]^3}\)