1. The numbers in the graph seem reasonable. I am not very good in math, I really try to understand in class and make notes but I don´t study at home. I will try to check my notes once in a while in order to do better.
2.What is the difference between refernce and first revolution angles? Today we talked about them in class and I didn´t understand how they are related.
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The difference between first revolution angles and reference angles is quite simple. First revolution angles are all those angles ranging from 0 to 360 degrees or from 0 to 2π radians. Reference angles are those found between 0 to 90 degrees or from 0 to (π/2) radians. Refernce angles have several uses. If you kno the sine or cosine of important reference angles such as 30,45,60 and 90 degrees or (π/6),(π/4),(π/3), and (π/2) radians then using simple logic you could find out the trig value of all other angles that are multiples of those angles. For example, if you know that sin45=√2/2 then you could easily figure out the value of the sine of 135°, 225°, 315°, 405° etc. Try to find the sine value of these angles and then check them with your calculator.
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