plzzzz give ans???????
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Step-by-step explanation:
x = cos10°cos20°cos40° = 8sin10°cos10°cos20°cos40° ÷ 8sin10°
= 4*2sin10°cos10°cos20°cos40° ÷ 8sin10° = 4 sin20°°cos20°cos40° ÷ 8sin10°
= 2*2 sin20°°cos20°cos40° ÷ 8sin10° = 2 sin40°cos40° ÷ 8sin10°
= sin80° ÷ 8sin10°
= cos10° ÷ 8sin10°
= cot10° ÷ 8
→ choose answer b).
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