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OpenStudy (anonymous):
Use a half-angle identity to find the exact value of sin75
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OpenStudy (freckles):
hint 150/2=75
OpenStudy (xapproachesinfinity):
\[\sin (75)=\pm \sqrt{\frac{1-\cos150}{2}}\]
OpenStudy (xapproachesinfinity):
that should be clear now!
OpenStudy (xapproachesinfinity):
cos (150)=-cos(30)
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