ok so today will be really easy review because it is christmas so that will be your present. today we will be going over co-terminal and refernce angle. a positive coterminal angle is when you add or subtract 360 to get a positive number and a negative is when you add or subtract 360 to get a negative number. a refernce angle is when you add or subtract 360 or 180 to get an angle between 0-90 degrees to "refer" to the other angle.
EX:
positve and negative coterminal angle for 108 degrees
positve: 468 degrees negative: -252
refernce angle for cos 135
= - cos 45
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