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OpenStudy (anonymous):
what is sin (7pi/4) ?
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OpenStudy (anonymous):
\[\sin \frac{ 7\pi }{ 4 }\]
OpenStudy (galleara):
since sin \[\pi/4=\sqrt{2}/2\] and 7pi/4 is in quadrant 4, the answer is\[-\sqrt{2}/2\]
OpenStudy (anonymous):
thank u
OpenStudy (galleara):
you're welcome :)
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