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OpenStudy (anonymous):
How to simplify? (8+7t)*cos(32*pi*t)+(8-7t)*cos(-32*pi*t)? Why is cos(32*pi*t) the same as cos(-32*pi*t)? They get combined and the answer becomes simply 16cos(32*pi*t)
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OpenStudy (anonymous):
bcoz cos(-x)=cos(x) cos(32*pi*t) the same as cos(-32*pi*t)
OpenStudy (anonymous):
but they are shifted by 2pi
OpenStudy (anonymous):
so since they are in the same location value stays the same ?
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