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2 sin 40^(@) sin 10^(@)=...

`2 sin 40^(@) sin 10^(@)=`

A

`cos 30^(@) + cos 50^(@)`

B

`cos30^(@) - cos50^(@)`

C

`cos50^(@)- cos 30^(@)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
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