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OpenStudy (anonymous):
help please
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OpenStudy (anonymous):
what is the exact value of \[\cos -\frac{ 9\pi }{ 4 }\]
OpenStudy (anonymous):
Since sin and cos repeat after 2pi you can turn -9pi/4 into -pi/4. Look at the table they have given you and you will see that -pi/4 is sqrt(2)/2
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