1.

In triangle ABC, angle A gt pi/2. A A_(1) and A A_(2) are the medium and altitude, espectively. If angle B A A_(1)= angle A _(1) A A_(2)=angle A _(2) AC, then sin^(3)""A/3 . Cos ""A/3is equal to

Answer»

`(3A^(3))/(16b^(2)c)`
`(3a^(3))/(64b ^(2)c)`
`(3a^(2))/(4b^(2)c)`
`(3a^(3))/(12 b^(2)c)`

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