AP EAMCET · Maths · Trigonometric Ratios & Identities
\(\cos ^4 \frac{\pi}{12}+\cos ^4 \frac{5 \pi}{12}+\cos ^4 \frac{7 \pi}{12}+\cos ^4 \frac{11 \pi}{12}=\)
- A \(2\)
- B \(1\)
- C \(\frac{7}{4}\)
- D \(\frac{3}{2}\)
Answer & Solution
Correct Answer
(C) \(\frac{7}{4}\)
Step-by-step Solution
Detailed explanation
\\(\\cos ^4 \\frac{\\pi}{12}+\\cos ^4 \\frac{5 \\pi}{12}+\\cos ^4 (\\pi - \\frac{5 \\pi}{12})+\\cos ^4 (\\pi - \\frac{\\pi}{12})\\) \\(2 \\left( \\cos ^4 \\frac{\\pi}{12}+\\cos ^4 \\frac{5 \\pi}{12} \\right)\\) \…
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