If A, B and C are the angles of a triangle and

| 1 1 1 |
| 1+sinA 1+sinB 1+sinC |
| sinA+sin^2A sinB+sin^2B sinC+sin^2C | = 0,

then which one of the following is correct?

Mathematics 2018 NDA Mathematics 2018 NDA 2018

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