AP EAMCET · Maths · Trigonometric Ratios & Identities
\(\cos 36^{\circ}-\cos 72^{\circ}\) is equal to
- A \(1\)
- B \(\frac{1}{2}\)
- C \(\frac{1}{4}\)
- D \(\frac{1}{8}\)
Answer & Solution
Correct Answer
(B) \(\frac{1}{2}\)
Step-by-step Solution
Detailed explanation
\(\cos 36^{\circ}-\cos 72^{\circ}=-2 \sin \left(\frac{36^{\circ}+72^{\circ}}{2}\right)\) \(\sin \left(\frac{72^{\circ}-36^{\circ}}{2}\right)\)…
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