मान लीजिए \(x = \sec \theta - \cos \theta \text{ and } y = \sec^4 \theta - \cos^4 \theta \) है। \((\frac{dy}{dx})^2\) किसके बराबर है?

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NDA-I (Mathematics) Official Paper (Held On: 13 Apr, 2025)
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  1. \(\frac{4(y^2+4)}{(x^2+4)}\)
  2. \(\frac{4(y^2-4)}{(x^2-4)}\)
  3. \(\frac{16(y^2+4)}{(x^2+4)}\)
  4. \(\frac{16(y^2-4)}{(x^2-4)}\)

Answer (Detailed Solution Below)

Option 3 : \(\frac{16(y^2+4)}{(x^2+4)}\)
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