1.

In which of the following situations, it is possible to have a DeltaABC ? (All symbols used have usual meaning in a triangle)

Answer»

` (a+c-b) (a-c+b) =4bc`
`b^(2)SIN 2C+COS ^(2)sin2B=ab`
`a=3,b=5, c=7 and C =(2pi)/(3)`
`cos ((A-C)/(2))=cos ((A+C)/(2))`

ANSWER :B::C


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