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cos 55^(@) + cos 65^(@) + cos 175^(@)= A...

`cos 55^(@) + cos 65^(@) + cos 175^(@)=` A)0B)1C)`sin 18^(@)`D)`cos 36 ^(@)`

A

0

B

1

C

`sin 18^(@)`

D

`cos 36 ^(@)`

Text Solution

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The correct Answer is:
A
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cos175^(@)+cos65^(@)+cos55^(@)=?

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