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Modeling with Functions - Page 2

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If f(x)= x^2 - 1 and g(x)=x+1, when x not =-1, find f(x)/g(x)=?
What does y=f(2x) mean? Usually I see the format f(x)=2x+15 for example.
How do you convert r = 4 cosθ + 4 sinθ into a cartesian equation?
Is the statement true: #f(x)=x^3#?

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