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In Section 9.2 we derive the identity $\cos 2 x=\cos ^{2} x-\sin ^{2} x .$ Use this to graph $y=\cos ^{2} x-\sin ^{2} x$ for one period.

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So we need to draw the graph of Why is he going to co sign squared off X minus sine squared effects and the question using identity that say's the coastline squared X minus sine squared accessible? Because I'm two X So basically, what we need to do is try autograph off course. I'm two X So this is a graph of down one, and the pdf would be to pie divided by two, which is equal to pi. So we set up our axes. I want the why access we will have two lines at y is equal to one. Why is equal to one and also advise you could turn negative one. And this is the great off our function. So why values will not go about one and they will not Coviello Now, since the pianist's pie we divide that into four equal parts of the pie, or for pie or two. Did he buy over four and high? And now we are ready to draw the graph for Colson. So there's the graph or why is it going to call site squared, X minus sine squared X