Mathematics, 30.01.2020 10:49 alisonlebron15
Use an appropriate half-angle formula to find the exact value of the expression. cos(9pi/8)
Answers: 3
(third quadrant), and 
for 
in this interval, you must take the negative root, so
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Use an appropriate half-angle formula to find the exact value of the expression. cos(9pi/8)...
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