1) What is this about?
This picture shows two examples from Unit R Concept 2. Here, we use right triangles draw in different quadrants to solve for sine, cosine, and tangent. Depending on which quadrant the triangles are drawn in, the values of these functions will be positive and/or negative.
2) What does the reader need to pay attention to?
The reader needs to pay attention to making sure that the triangles are drawn in the correct quadrants. Also, when finding the missing piece of the triangle, be careful of the signs (left and down is negative, right and up is positive). Lastly, make sure to use the correct sum and difference formulas.
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