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OpenStudy (anonymous):
Find sin 7B using (cosB+isinB)^7. Then find exact value of sin(2pi/7)xsin(pi/7)xsin(3pi/7)
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OpenStudy (anonymous):
Note the x is a symbol ofmultiplication / It is not the alphabet x
OpenStudy (anonymous):
Can someon solve this? I am not getting the right answer . i amn getting \[i \sqrt{7}/2\]
OpenStudy (perl):
did you use demoivre's theorem
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