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JEE Mains · Maths · STD 11 - 8. sequence and series

For the functions \(f(\theta) = \alpha\tan^2\theta + \beta\cot^2\theta\), and \(g(\theta) = \alpha\sin^2\theta + \beta\cos^2\theta\), \(\alpha > \beta > 0\), let \(\min_{0 < \theta < \pi/2}f(\theta) = \max_{0 < \theta < \pi}g(\theta)\). If the first term of a G.P. is \(\left(\dfrac{\alpha}{2\beta}\right)\), its common ratio is \(\left(\dfrac{2\beta}{\alpha}\right)\) and the sum of its first \(10\) terms is \(\dfrac{m}{n}\), \(\gcd(m, n) = 1\), then \(m + n\) is equal to _______.

  1. A 1275
  2. B 1276
  3. C 1277
  4. D 1279
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Answer & Solution

Correct Answer

(D) 1279

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Detailed explanation

For the function \(f(\theta) = \alpha\tan^2\theta + \beta\cot^2\theta\), applying the AM-GM inequality gives: \(\alpha\tan^2\theta + \beta\cot^2\theta \ge 2\sqrt{\alpha\tan^2\theta \cdot \beta\cot^2\theta} = 2\sqrt{\alpha\beta}\) Thus, \(\min_{0 \beta > 0\), the maximum value of…
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