Section+1.3+Graphing+Sine+and+Cosine

=Section 1.3 Graphing Cosine and Sine Functions= 8/23/11

math {}$ We started today with a group activity. We were supposed to discuss with our group members and graph the functions $f(x)=\sin(x)$ and $g(x)=\cos(x)$. After giving us some time, Mrs. Tyson displayed several groups graphs using the document camera and we talked about the strengths and the weaknesses of the graphs. Some good tips that came out of this. It's good to mark the quarter periods for the scale along the x-axis and then to plot the function values for those points as well. You should graph at least two full periods. You should make sure that the graph is wavy instead of being pointy.

Next we looked at some of the CYU problems. One question got at the point that we can look at the intersections of graphs to find solutions to equaitons. We need to pick appropriate technology when we are solving equations in this way. The next three questions all dealt with evaluating trig functions at negative angles. Right at the end of class, Mrs. Tyson mentioned something about even/odd functions and symmetry which was tied into this idea.

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