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1+ cos 10^(@) + cos 20^(@)+ cso 30^(@)=...

`1+ cos 10^(@) + cos 20^(@)+ cso 30^(@)=`

A

`4 cos 5^(@) cos 10^(@) cos 15^(@)`

B

`4 cos 10^(@) cos 20^(@) cos 30^(@)`

C

`4 sin 5^(@) sin 10^(@) sin 15^(@)`

D

`4 sin 10^(@) sin 20^(@) sin 30^(@)`

Text Solution

Verified by Experts

The correct Answer is:
A
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