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Is it possible to have a DeltaABC with a...

Is it possible to have `a DeltaABC` with `a=3,b=5, c=7 and C =(2pi)/(3)` ?

A

(a)` (a+c-b) (a-c+b) =4bc`

B

(b)`b^(2)sin 2C+cos ^(2)sin2B=ab`

C

(c)`a=3,b=5, c=7 and C =(2pi)/(3)`

D

(d)`cos ((A-C)/(2))=cos ((A+C)/(2))`

Text Solution

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The correct Answer is:
B, C
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