1.

If (a + b)^(2) = c^(2) + ab " in a " Delta ABC , Sin^(4) B + Sin^(4) C = Sin^(2) Bsin^(2) C + 2Sin^(2) Csin^(2)A = 2Sin^(2) B then A =

Answer»

`pi/6, (5PI)/6`
`pi/3, (5pi)/6`
`pi/3, pi/2`
`pi/4, (3PI)/4`

ANSWER :A


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