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OpenStudy (anonymous):
How do I rewrite cos3x with only sinx and cosx?
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OpenStudy (anonymous):
cos(3x) = cos(2x + x) = cos(2x)cos(x) - sin(2x)sin(x)
OpenStudy (anonymous):
Use the sum / difference identities Cos(x+y)= cos(x)cos(y) - sin(x)sin(y)
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