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If a , b ,\ A are given in a triangle an...

If `a , b ,\ A` are given in a triangle and `c_1a n d\ c_2` are two possible values of third side such that `c_1^2+c_1c_2+c_2^2=a^2` , then `A` is equal to `30^0` (b) `60^0` (c) `90^0` (d) `120^0`

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