1.

A: In a Delta ABC (a+b+c) (b+c-a) =Abc if 0 lt lamda lt 4 R: In a Delta ABC,-1 le cos A le 1

Answer»

A is TRUE, R is true and R is CORRECT explanation of A
A is true, R is true and R is not correct explanation of A
A is true, R is FALSE
A is false, R is true

Answer :C


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