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:
- A \(\frac{2}{3}\)
- B \(\frac{2}{\sqrt{7}}\)
- C \(\frac{\sqrt{2}}{7}\)
- D \(\sqrt{\frac{2}{7}}\)
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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