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JEE Mains · Maths · STD 11 - 9. straight line

माना एक सांद्रिभुज त्रिगुण \(ABC\) में \(A\) बिंदु \((-1,0),\) \(\angle \mathrm{A}=\frac{2 \pi}{3}, \mathrm{AB}=\mathrm{AC}\) है तथा \(\mathrm{B}\), धनात्मक \(\mathrm{x}\)-अक्ष पर है। यदि \(\mathrm{BC}=4 \sqrt{3}\) तथा रेखा \(\mathrm{BC}\), रेखा \(\mathrm{y}=\mathrm{x}+3\) को \((\alpha, \beta)\) पर काटती है, तो \(\frac{\beta^4}{\alpha^2}\) = ...........

  1. A \(85\)
  2. B \(36\)
  3. C \(45\)
  4. D \(75\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(36\)

Step-by-step Solution

Detailed explanation

\(\frac{\mathrm{c}}{\sin 30^{\circ}}=\frac{4 \sqrt{3}}{\sin 120^{\circ}}\) [By sine rule] \(2 c=8 \Rightarrow c=4\) \( \mathrm{AB}=|(\mathrm{b}+1)|=4 \) \( \mathrm{~b}=3, \mathrm{~m}_{\mathrm{AB}}=0 \) \( \mathrm{~m}_{\mathrm{BC}}=\frac{-1}{\sqrt{3}} \)…
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