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If A+ B + C = pi, then cos^(2) A + cos ...

If ` A+ B + C = pi,` then `cos^(2) A + cos ^(2) B + cos ^(2) C` is equal to : A)`1 - cos A cos B cos C` B)`1 - 2 cos A cos B cos C` C)`2 cos A cos B cos C` D)`1 + cos A cos B cos C`

A

`1 - cos A cos B cos C`

B

`1 - 2 cos A cos B cos C`

C

`2 cos A cos B cos C`

D

`1 + cos A cos B cos C`

Text Solution

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The correct Answer is:
B
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