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CUET · MATHS · PYQ PAPER 2023

If \(\theta\) is the angle between the vectors \(2\hat{i} - 2\hat{j} + 4\hat{k}\) and \(3\hat{i} + \hat{j} + 2\hat{k}\), then value of \(\sin \theta\) is:

  1. A \(\frac{2}{3}\)
  2. B \(\frac{2}{\sqrt{7}}\)
  3. C \(\frac{\sqrt{2}}{7}\)
  4. D \(\sqrt{\frac{2}{7}}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{2}{\sqrt{7}}\)

Step-by-step Solution

Detailed explanation

Let \(\vec{a} = 2\hat{i} - 2\hat{j} + 4\hat{k}\) and \(\vec{b} = 3\hat{i} + \hat{j} + 2\hat{k}\). \(|\vec{a}| = \sqrt{2^2 + (-2)^2 + 4^2} = \sqrt{4+4+16} = \sqrt{24}\) \(|\vec{b}| = \sqrt{3^2 + 1^2 + 2^2} = \sqrt{9+1+4} = \sqrt{14}\)…
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