If \[\alpha +\beta +\gamma =\pi \]then the minimum value of \[cos\text{ }A+cos\text{ }B+cos\text{ }C\]

If \[\alpha +\beta +\gamma =\pi \]then the minimum value of \[cos\text

1.	If \[\alpha +\beta +\gamma =\pi \]then the minimum value of \[cos\text{ }A+cos\text{ }B+cos\text{ }C\]
A.	is zero
B.	is positive
C.	lies between \[-2\] and \[-3\]
D.	is \[-3\]
Answer» E.

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If \[\alpha +\beta +\gamma =\pi \]then the minimum value of \[cos\text{ }A+cos\text{ }B+cos\text{ }C\]

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