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JEE Mains · Maths · STD 12 - 6. Application of derivatives

વક્ર \(x = 4t^2 + 3,\,\,y = 8t^3 - 1,\,\,t \in R,\) નો \(t\) પ્ર્ચલ ધરાવતો બિંદુ \(P\) આગળ નો સ્પર્શકએ વક્ર ને ફરીથી \(Q\) બિંદુમાં છેદે છે \(Q\) ના યામ મેળવો.

  1. A \((16t^2 +3, - 64t^3 - 1)\)
  2. B \((4t^2 + 3, - 8t^3 - 2)\)
  3. C \((t^2 + 3,\,t^3 - 1)\)
  4. D \((t^2 + 3, - t^3 - 1)\)
Verified Solution

Answer & Solution

Correct Answer

(D) \((t^2 + 3, - t^3 - 1)\)

Step-by-step Solution

Detailed explanation

\(P\left( {4{t^2} + 3,8{t^3} - 1} \right)\) \(\frac{{dy/dt}}{{dt/dt}} = \frac{{dy}}{{dx}} = 3t\) (slope of tangent at \(P\)) Let \(Q = \left( {4{\lambda ^2} + 3,8{\lambda ^3} - 1} \right)\) slope of \(PQ = 3t\) \(\frac{{8{t^3} - 8{\lambda ^3}}}{{4{t^2} - 4{\lambda ^2}}} = 3t\)…
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