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OpenStudy (anonymous):
Determine the sign of cos pi/7 without using a calculator.
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hartnn (hartnn):
in which quadrant does pi/7 lie ?
OpenStudy (anonymous):
it doesn't say .
hartnn (hartnn):
hint : 1st quadrant is 0 to pi/2, 2nd quadrant is pi/2 to pi 3rd is pi to 3pi/2 and 4th is 3pi/2 to 2pi
OpenStudy (anonymous):
so would it be the second one?
hartnn (hartnn):
|dw:1382465951034:dw|
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