# What is the graph of #y=cos^2 x#?

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Kevin B.
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Mar 22, 2015

Here is the graph:

graph{y=(cosx)^2 [-10, 10, -5, 5]}

Remember the double-angle formula for cosine:

Add one to both sides:

Divide both sides by two:

You now have a standard cosine equation with

Amplitude =

Period =

Vertical Shift = up by

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