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If A+B +C= pi /4 then 4 cos ""A/2 cos ...

`If A+B +C= pi /4` then
` 4 cos ""A/2 cos ""B/2 cos ""C/2 - cos ""pi/8=`

A

`cos ((pi)/(4) -A)+ cos ((pi)/(4)-B)+ cos ((pi)/(4) -C)`

B

`cos ((pi)/(8) -A)+ cos ((pi)/(8)-B)+ cos ((pi)/(8) -C)`

C

`sin ((pi)/(4) -A)+ cos ((pi)/(4)-B)+ cos ((pi)/(4) -C)`

D

`sin ((pi)/(8) -A)+ cos ((pi)/(8)-B)+ cos ((pi)/(8) -C)`

Text Solution

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The correct Answer is:
B
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