For any triangle ABC, If B=3C, show tha...

For any triangle ABC, If `B=3C`, show that `cosC=sqrt((b+c)/(4c)) and sin(A/2)=(b-c)/(2c)`

A

`sinC,"sin"A/2`

B

`cosC, "sin"A/2`

C

`sinC,"cos"A/2`

D

None of these

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The correct Answer is:

B

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