What is this problem about?
This problem goes over one from Unit R Concept 2 that is dealing with using sum and difference formulas when given values of right triangles. We have basically put together all of our knowledge from the unit circle, right triangles, SOHCAHTOA, and sum/difference formulas in order to solve a problem for this concept. This problem is mainly dealing with recognizing/identifying the trig functions with the limited information given of the triangle so that later we are able to use this information to solve for the exact values using the new sum and difference formulas we have. We then use substitution to plug in the values into the equations, which leads us to finally simplify the fraction and get our final answer.
What does the viewer need to pay special attention to in order to do the problem correctly?
When solving a problem like this from unit R the viewer needs to pay special attention to how we are able to identify the values of each trig. function from the two separate triangles. It is important that we do so becuase if you identify one trig function incorrectly that can result in your whole answer being wrong. The viewer also needs to pay special attention to the equations used to solve for the exact values of the trig. functions. Also, it is imperative that one is very careful when solving and simplifying, making it even more necessary to check your answer afterwards. It is also importnat that the viewer realize the difference in the quadrants in which these trig. functions fall in due to their signs (+/-).
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