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Mathematics 90 Online
OpenStudy (anonymous):

Find sin 7B using (cosB+isinB)^7. Then find exact value of sin(2pi/7)xsin(pi/7)xsin(3pi/7)

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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