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

जिसके लिए, प्रत्येक \(t \in \mathbb{R}\) के लिए सदिश \(\vec{a}=\alpha t \hat{i}+6 \hat{j}-3 \hat{k}\) और \(\vec{b}=t \hat{i}-2 \hat{j}-2 \alpha t \hat{k}\) अधिक कोण बनाते हों, ऐसे सभी \(a\) का समुच्चय .............. है।

  1. A \([0,1)\)
  2. B \((-2,0]\)
  3. C  \(\left(-\frac{4}{3}, 0\right]\)
  4. D  \(\left(-\frac{4}{3}, 1\right)\)
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Answer & Solution

Correct Answer

(C)  \(\left(-\frac{4}{3}, 0\right]\)

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Detailed explanation

\( \overrightarrow{\mathrm{a}}=\alpha t \hat{\mathrm{i}}+6 \hat{\mathrm{j}}-3 \hat{\mathrm{k}} \) \( \overrightarrow{\mathrm{b}}=\mathrm{t}-2 \hat{\mathrm{j}}-2 \alpha \mathrm{t} \hat{\mathrm{k}} \)…
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