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JEE Mains · Maths · STD 11 - Trigonometrical equations

माना \([0,4 \pi]\) में समीकरण \(\sin ^{4} \theta+\cos ^{4} \theta-\sin \theta \cos \theta=0\) के सभी हलों (रिडियन में) का योग \(S\) है। तो \(\frac{8 S }{\pi}\) बराबर है .......... |

  1. A \(87\)
  2. B \(78\)
  3. C \(56\)
  4. D \(65\)
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Answer & Solution

Correct Answer

(C) \(56\)

Step-by-step Solution

Detailed explanation

Given equation \(\sin ^{4} \theta+\cos ^{4} \theta-\sin \theta \cos \theta=0\) \(\Rightarrow 1-\sin ^{2} \theta \cos ^{2} \theta-\sin \theta \cos \theta=0\) \(\Rightarrow 2-(\sin 2 \theta)^{2}-\sin 2 \theta=0\) \(\Rightarrow(\sin 2 \theta)^{2}+(\sin 2 \theta)-2=0\)…
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