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JEE Mains · Maths · STD 12 - 10. vector algebra

જો \(\overrightarrow{ a }\) અને \(\overrightarrow{ b }\) એ એકમ સદીશો હોય તો \(\sqrt{3}|\overrightarrow{ a }+\overrightarrow{ b }|+|\overrightarrow{ a }-\overrightarrow{ b }|\) નું મહત્તમ કિમત શોધો 

  1. A \(6\)
  2. B \(5\)
  3. C \(3\)
  4. D \(4\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(4\)

Step-by-step Solution

Detailed explanation

\(\sqrt{3}|\vec{a}+\vec{b}|+|\vec{a}-\vec{b}|\) \(=\sqrt{3}(\sqrt{2+2 \cos \theta})+\sqrt{2-2 \cos \theta}\) \(=\sqrt{6}(\sqrt{1+\cos \theta})+\sqrt{2}(\sqrt{1-\cos \theta})\) \(=2 \sqrt{3}\left|\cos \frac{\theta}{2}\right|+2\left|\sin \frac{\theta}{2}\right|\)…
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