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JEE Mains · Maths · STD 11 - 3. trignometrical ratios,functions and identities

यदि \(\tan 15^{\circ}+\frac{1}{\tan 75^{\circ}}+\frac{1}{\tan 105^{\circ}}+\tan 195^{\circ}=2 \mathrm{a}\) है, तो \(\left(a+\frac{1}{a}\right)\) का मान है :

  1. A \(4\)
  2. B \(4-2 \sqrt{3}\)
  3. C \(2\)
  4. D \(5-\frac{3}{2} \sqrt{3}\)
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Answer & Solution

Correct Answer

(A) \(4\)

Step-by-step Solution

Detailed explanation

\(\tan 15^{\circ}=2-\sqrt{3}\) \(\frac{1}{\tan 75^{\circ}}=\cot 75^{\circ}=2-\sqrt{3}\) \(\frac{1}{\tan 105^{\circ}}=\cot \left(105^{\circ}\right)=-\cot 75^{\circ}=\sqrt{3}-2\) \(\tan 195^{\circ}=\tan 15^{\circ}=2-\sqrt{3}\) \(2(2-\sqrt{3})=2 a \Rightarrow a =2-\sqrt{3}\)…
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