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If X = F(T) and Y = G(T), Then D 2 Y D X 2 is Equal to (A) F ′ G ′′ − G ′ F ′′ ( F ′ ) 3 - Mathematics

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प्रश्न

If x = f(t) and y = g(t), then \[\frac{d^2 y}{d x^2}\] is equal to

 

विकल्प

  • \[\frac{f' g'' - g'f''}{\left( f' \right)^3}\]

  • \[\frac{f' g'' - g'f''}{\left( f' \right)^2}\]

  • \[\frac{g''}{f''}\]

  • \[\frac{f'' g' - g'' f'}{\left( g' \right)^3}\]

MCQ
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उत्तर

(a) \[\frac{f' g'' - g'f''}{\left( f' \right)^3}\]

Here,
x = f(t) and y = g(t)

\[\Rightarrow \frac{dx}{dt} = f'\left( t \right) \text { and } \frac{dy}{dt} = g'\left( t \right)\]

\[ \therefore \frac{dy}{dx} = \frac{g'\left( t \right)}{f'\left( t \right)}\]

\[\Rightarrow \frac{d^2 y}{d x^2} = \frac{d}{dt}\left\{ \frac{g^{'} \left( t \right)}{f^{'} \left( t \right)} \right\} \times \frac{dt}{dx}\]

\[ = \frac{f^{'} \left( t \right) g^{''} \left( t \right) - g^{'} \left( t \right) f^{''} \left( t \right)}{\left[ f^{'} \left( t \right) \right]^2} \times \frac{1}{f'\left( t \right)}\]

\[ = \frac{f^{'} \left( t \right) g^{''} \left( t \right) - g^{'} \left( t \right) f^{''} \left( t \right)}{\left[ f^{'} \left( t \right) \right]^3}\]

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अध्याय 12: Higher Order Derivatives - Exercise 12.3 [पृष्ठ २३]

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आरडी शर्मा Mathematics [English] Class 12
अध्याय 12 Higher Order Derivatives
Exercise 12.3 | Q 14 | पृष्ठ २३

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