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JEE Mains · Maths · STD 11 - Trigonometrical equations

यदि \(2 \cos \theta+\sin \theta=1\left(\theta \neq \frac{\pi}{2}\right)\) है, तो \(7 \cos \theta+6 \sin \theta\) बराबर है 

  1. A \(\frac{1}{2}\)
  2. B \(\frac{46}{5}\)
  3. C \(\frac{11}{2}\)
  4. D \(2\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(2\)

Step-by-step Solution

Detailed explanation

Given \(2 \cos \theta+\sin \theta=1\) Squaring both sides, we get \((2 \cos \theta+\sin \theta)^{2}=1^{2}\) \(\Rightarrow 4 \cos ^{2} \theta+\sin ^{2} \theta+4 \sin \theta \cos \theta=1\)…
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