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OpenStudy (anonymous):
simplify: cos(6x)cos(2x)-sin(6x)sin(2x)
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OpenStudy (anonymous):
Go to your compound angle formulae; this one will stand out to you blatantly.
myininaya (myininaya):
cos(6x+2x)
myininaya (myininaya):
cos(8x)
OpenStudy (anonymous):
how do you simplify this though? i am having trouble with the steps. and what is the compound formula? i don't believe we went over that in class.
myininaya (myininaya):
cos(8x) is simplified. cos(u-v)=cos(u)cos(v)+sin(u)sin(v) and cos(u+v)=cos(u)cos(v)-sin(u)sin(v) is a couple of the formulas
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OpenStudy (anonymous):
okay, thank you so much!
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