The value of ^ 3 ( 8 ) ( 3 8 )+ ^ 3 ( 8 ) ( 3 8 ) is :
Mathematics · JEE Main · NTA Exams — Trigonometry
The value of \(\cos ^{3}\left(\frac{\pi}{8}\right) \cdot \cos \left(\frac{3 \pi}{8}\right)+\sin ^{3}\left(\frac{\pi}{8}\right) \sin \left(\frac{3 \pi}{8}\right)\) is :
- \(\frac{1}{2 \sqrt{2}}\)
- \(\frac{1}{\sqrt{2}}\)
- \(\frac{1}{4}\)
- \(\frac{1}{2}\)
Answer
(A) 1 2 2
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