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

वक्र \(y=3 \sin \theta \cos \theta, x= e ^{\theta} \sin \theta\), \(0 \leq \theta \leq \pi\), के लिए स्पशरिखा \(x\)-अक्ष के समांतर है, जब \(\theta\) बराबर है

  1. A \(\frac{3\pi}{4}\)
  2. B \(\frac{\pi}{2}\)
  3. C \(\frac{\pi}{4}\)
  4. D \(\frac{\pi}{6}\)
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Answer & Solution

Correct Answer

(C) \(\frac{\pi}{4}\)

Step-by-step Solution

Detailed explanation

Given, \(y = 3\sin \theta .\cos \theta \) \(\frac{{dy}}{{d\theta }} = 3\left[ {\sin \theta \left( { - \sin \theta } \right) + \cos \theta \left( {\cos \theta } \right)} \right]\)…
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