---A problem is presented from Unit R Concept 2 which is using sum and difference formulas when given values using right triangles. This goes over a problem in which it is worked out step by step. It goes over how to solve for the exact values when the two triangles lie in different quadrants. It then goes over to show how to solve for the sine sum and the tangent difference.
What does the viewer need to play close attention to in order to do the problem correctly?
---One really important thing to pay close attention to is the way and the quadrant the triangle is drawn. It is very important to consider the signs; if it is positive it will go up or right and if it is negative it will go down or left. These values are derived from the trig functions given.
----Another thin to pay close attention to is how to correctly plug it into the tangent difference formula. Sine they are fractions it is okay to use the calculator to have the fraction more simple and then we can continue solving by hand.
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