The minimum value of the expression sin...

The minimum value of the expression `sinalpha+sin beta+sin gamma`, where `alpha, beta, gamma` are real numbers satisfying `alpha+beta+gamma=pi`, is

positive

zero

negative

None of these

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Statement I The minimum value of the expression sinalpha+sinbeta+singamma where alpha, beta, gamma are real numbers such that alpha+beta+gamma=pi is negative. Statement II If alpha+beta+gamma=pi , then alpha, beta, gamma are the angles of a triangle.

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