AP EAMCET · Maths · Trigonometric Ratios & Identities
\(1+\cos 10^{\circ}+\cos 20^{\circ}+\cos 30^{\circ}=\)
- A \(4 \sin 10^{\circ} \sin 20^{\circ} \sin 30^{\circ}\)
- B \(4 \cos 5^{\circ} \cos 10^{\circ} \cos 15^{\circ}\)
- C \(4 \cos 10^{\circ} \cos 20^{\circ} \cos 30^{\circ}\)
- D \(4 \sin 5^{\circ} \sin 10^{\circ} \sin 15^{\circ}\)
Answer & Solution
Correct Answer
(B) \(4 \cos 5^{\circ} \cos 10^{\circ} \cos 15^{\circ}\)
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