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

જો \(\sin\left(\dfrac{\pi}{18}\right) \sin\left(\dfrac{5\pi}{18}\right) \sin\left(\dfrac{7\pi}{18}\right) = K\) હોય, તો \(\sin\left(\dfrac{10K\pi}{3}\right)\) નું મૂલ્ય શું છે?

  1. A \(\dfrac{\sqrt{3} + 1}{2\sqrt{2}}\)
  2. B \(\dfrac{\sqrt{3} - 1}{\sqrt{2}}\)
  3. C \(\dfrac{\sqrt{3}}{2}\)
  4. D \(\dfrac{1}{2}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\dfrac{\sqrt{3} + 1}{2\sqrt{2}}\)

Step-by-step Solution

Detailed explanation

આપેલ છે કે \(K = \sin\left(\dfrac{\pi}{18}\right) \sin\left(\dfrac{5\pi}{18}\right) \sin\left(\dfrac{7\pi}{18}\right)\) પ્રમાણભૂત ત્રિકોણમિતિય નિત્યસમ \(\sin(\theta) \sin\left(\dfrac{\pi}{3} - \theta\right) \sin\left(\dfrac{\pi}{3} + \theta\right) = \dfrac{1}{4} \sin(3\theta)\)…
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