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JEE Mains · Maths · STD 11 - 4.2 Quadratic equations and inequations

જો \(S\) એ બધા \(\alpha  \in  R\) નો ગણ છે કે જેથી \(cos\,2 x + \alpha  \,sin\, x = 2\alpha  -7\) ને ઉકેલગણ મળે તો \(S\) = 

  1. A \([3, 7]\)
  2. B \(R\)
  3. C \([2, 6]\)
  4. D \([1, 4]\)
Verified Solution

Answer & Solution

Correct Answer

(C) \([2, 6]\)

Step-by-step Solution

Detailed explanation

Given, \(\cos 2 x+2 \sin x=2 \alpha-7\) \(\Rightarrow 1-2 \sin ^{2} x+\alpha \sin x=2 \alpha-7\) \(\Rightarrow 2 \sin ^{2} x-\alpha \sin x+2 \alpha-8=0\) \(\Rightarrow \sin x=\frac{\alpha \pm \sqrt{\alpha^{2}-8(2 \alpha-8)}}{4}\)…
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