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If x= cos 10^(@)cos 20^(@) cos 40^(@), t...

If `x= cos 10^(@)cos 20^(@) cos 40^(@),` then the value of x is

A

`(1)/(4) tan 10^(@)`

B

`(1)/(8) cot 10^(@)`

C

`(1)/(8) cosec 10^(@)`

D

`(1)/(8) sec 10^(@)`

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The correct Answer is:
A
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