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OpenStudy (danmac0710):
cos (x) + cos (3x) = 0.5, 0
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OpenStudy (raden):
how come u got sin4x=sinx ?
OpenStudy (danmac0710):
I have a mark scheme here - it's an old iB question. I can solve that part from there on but not sure how to get there from the start. ANy ideas?
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