Question

What is the equation of the midline for the function f (x)?

f (t) = 3 cos (x) – 2.5

Answer 1

y = -2.5

Explanation:

For such a problem as this, you can replace all sine or cosine functions with their midline value of 0. Then you have ...

f(x) = 0 -2.5

which simplifies to ...

f(x) = -2.5

You can leave the equation like this, or write it as ...

y = -2.5

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Perhaps you can see that the midline is the value of any constant added to a sine or cosine function.