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cos 20^(@) + cos 100^(@) + cos 140^(@)= ...

`cos 20^(@) + cos 100^(@) + cos 140^(@)=` A)`cos 130^(@)`B)`cos 45 ^(@)`C)0D)none of these

A

`cos 130^(@)`

B

`cos 45 ^(@)`

C

0

D

none of these

Text Solution

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The correct Answer is:
C
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cos20^(@)+cos100^(@)+cos140^(@)=

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