Question:medium
If \( x = 2\cos t - \cos 2t \) and \( y = 2\sin t - \sin 2t \), then \( \frac{dy}{dx} \) at \( t = \frac{\pi}{2} \) is
If \( x = 2\cos t - \cos 2t \) and \( y = 2\sin t - \sin 2t \), then \( \frac{dy}{dx} \) at \( t = \frac{\pi}{2} \) is
Show Hint
For parametric curves, always compute derivatives separately before substituting values.
Updated On: Apr 30, 2026
- \( -1 \)
- \( 0 \)
- \( \frac{1}{2} \)
- \( 1 \)
- \( 3 \)
Show Solution
The Correct Option is D
Solution and Explanation
Was this answer helpful?
0
Top Questions on Derivatives of Functions in Parametric Forms
- If the lines \( \frac{x-k}{2} = \frac{y+1}{3} = \frac{z-1}{4} \) and \( \frac{x-3}{1} = \frac{y - 9/2}{2} = z/1 \) intersect, then the value of \( k \) is:
- MHT CET - 2024
- Mathematics
- Derivatives of Functions in Parametric Forms
- If \( 2 \tan^2 \theta - 5 \sec \theta = 1 \) has exactly 7 solutions in the interval \(\left[ 0, \frac{n\pi}{2} \right],\) for the least value of \( n \in \mathbb{N} \) then \(\sum_{k=1}^{n} \frac{k}{2^k}\) is equal to:
- JEE Main - 2024
- Mathematics
- Derivatives of Functions in Parametric Forms
The curve y(x) = ax3 + bx2 + cx + 5 touches the x-axis at the point P(–2, 0) and cuts the y-axis at the point Q, where y′ is equal to 3. Then the local maximum value of y(x) is
- JEE Main - 2022
- Mathematics
- Derivatives of Functions in Parametric Forms
- Let $x=\sin \left(2 \tan ^{-1} \alpha\right)$ and $y=\sin \left(\frac{1}{2} \tan ^{-1} \frac{4}{3}\right)$ If $S =\left\{\alpha \in R : y ^2=1- x \right\}$, then $\displaystyle\sum_{\alpha \in S } 16 \alpha^3$ is equal to ______
- JEE Main - 2023
- Mathematics
- Derivatives of Functions in Parametric Forms
- Want to practice more? Try solving extra ecology questions todayView All Questions
