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OpenStudy (anonymous):
i need do demonstrate sin 5+ sin 125+sin245=0
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OpenStudy (anonymous):
Hint: Think of a circle! The three angles give you equidistant points on the unit circle.
OpenStudy (anonymous):
man this is though
OpenStudy (anonymous):
Okay, how about doing it algebraically.
OpenStudy (anonymous):
Do you know the addition theorem for sine?
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