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JEE Mains · Maths · STD 11 - Trigonometrical equations

\(ABCD\) एक समलम्ब चतुर्भुज है जिसमें \(AB\) और \(CD\) समांतर है तथाा \(BC \perp CD .\) यदि \(\angle ADB =\theta, BC =p\) तथा \(CD =q\), तो \(AB\) बराबर है,

  1. A \(\frac{{\left( {{p^2} + {q^2}} \right)\sin \theta }}{{pcos\;\theta + qsin\theta }}\)
  2. B \(\;\frac{{\;{p^2} + {q^2}\cos \theta }}{{pcos\;\theta + qsin\theta }}\)
  3. C \(\;\frac{{\left( {{p^2} + {q^2}} \right)}}{{{p^2}cos\;\theta + {q^2}sin\theta }}\)
  4. D \(\;\frac{{\left( {{p^2} + {q^2}} \right)\sin \theta }}{{{{\left( {pcos\;\theta + qsin\theta } \right)}^2}}}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{{\left( {{p^2} + {q^2}} \right)\sin \theta }}{{pcos\;\theta + qsin\theta }}\)

Step-by-step Solution

Detailed explanation

Let \(AB=x\) \(\tan \,(\pi \, - \,\theta \, - \,\alpha )\, = \,\frac{p}{{x - q}}\, \Rightarrow \,\tan \,(\theta \, + \,\alpha )\, = \,\frac{p}{{q - x}}\) \( \Rightarrow \,q\, - \,x\, = p\,\,\cot \,(\theta \, + \,\alpha )\)…
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