csat-suneung 2024 Q24_calculus

csat-suneung · South-Korea · csat__math 3 marks Parametric differentiation
For the curve represented parametrically by $$x = \ln(t^3 + 1), \quad y = \sin\pi t$$ where $t > 0$, find the value of $\frac{dy}{dx}$ at $t = 1$. [3 points]
(1) $-\frac{1}{3}\pi$
(2) $-\frac{2}{3}\pi$
(3) $-\pi$
(4) $-\frac{4}{3}\pi$
(5) $-\frac{5}{3}\pi$
For the curve represented parametrically by
$$x = \ln(t^3 + 1), \quad y = \sin\pi t$$
where $t > 0$, find the value of $\frac{dy}{dx}$ at $t = 1$. [3 points]\\
(1) $-\frac{1}{3}\pi$\\
(2) $-\frac{2}{3}\pi$\\
(3) $-\pi$\\
(4) $-\frac{4}{3}\pi$\\
(5) $-\frac{5}{3}\pi$