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If X = 10 ( T − Sin T ) , Y = 12 ( 1 − Cos T ) , Find D Y D X . ? - Mathematics

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Question

If \[x = 10 \left( t - \sin t \right), y = 12 \left( 1 - \cos t \right), \text { find } \frac{dy}{dx} .\] ?

 

Sum
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Solution

\[\text { We have, x  }= 10\left( t - \sin t \right) \text { and y } = 12\left( 1 - \cos t \right)\]

\[ \Rightarrow \frac{dx}{dt} = \frac{d}{dt}\left[ 10\left( t - \sin t \right) \right] \text { and }\frac{dy}{dt} = \frac{d}{dt}\left[ 12\left( 1 - \cos t \right) \right]\]

\[ \Rightarrow \frac{dx}{dt} = 10\frac{d}{dt}\left( t - \sin t \right) \text { and } \frac{dy}{dt} = 12\frac{d}{dt}\left( 1 - \cos t \right)\]
\[ \Rightarrow \frac{dx}{dt} = 10\left( 1 - \cos t \right) \text{ and } \frac{dy}{dt} = 12\left[ 0 - \left( - \sin t \right) \right] = 12 \sin t\]
\[ \therefore \frac{dy}{dx} = \frac{\frac{dy}{dt}}{\frac{dx}{dt}} = \frac{12 \sin t}{10\left( 1 - \cos t \right)}\]

\[ \Rightarrow \frac{dy}{dx} = \frac{12 \times 2\sin\frac{t}{2}\cos\frac{t}{2}}{10 \times 2 \sin^2 \frac{t}{2}}\]

\[ \Rightarrow \frac{dy}{dx} = \frac{6}{5}\cot\frac{t}{2}\]

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Chapter 11: Differentiation - Exercise 11.07 [Page 104]

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RD Sharma Mathematics [English] Class 12
Chapter 11 Differentiation
Exercise 11.07 | Q 22 | Page 104

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