1.

If a, b and A are given andc_(1) , c_(3) are two values of the side c in the ambiguous case, then c_(1)^(2) + c_(2)^(2) - 2c_(1)c_(2) * cos 2 A =

Answer»

`4A^(2) COS^(2)A`
`4a^(2)SIN^(2)A`
`4a^(2)`
`4a^(2) cos^(2)2A`

Answer :a


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