Q. What is the value of 8cos10°.cos20°.cos40°

  • (A) tan10°
  • (B) cot10°
  • (C) cosec10°
  • (D) sec10°
✅ Correct Answer: (B) cot10°
Explanation:

8cosx.cos2x.cos4x = sin8x / sinx

x = 10 

= sin80/sin10

= cot10

Published by Rahul ⭐ 75 Points at 23-Oct-2020 05:14 am in Math

Explanation by: Roshan

8cosx.cos2x.cos4x = sin8x / sinx

x = 10 

= sin80/sin10

= cot10

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