1.

If in a Delta^("le") ABC, a, b and angle A are given C_(1),C_(2) are possibel values of 3rd side then

Answer»

`C_(1)+C_(2)=2B COSA`
`C_(2)C_(2)=b^(2)-a^(2)`
`C_(1)^(2)+C_(2)^(2)- angleC_(1)C_(2) Cos2A=4a^(2)cos^(2)A`
`C_(1)+C_(2)=2A CosB`

ANSWER :A::B::C


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