They lived in the Northern plains
a primary source is a source from the time and place of the event, like a photograph that was taken of a president from 1920. If it was something like a book written in 2015 about the picture from 1920, that would be a secondary source. Hope this helps!
Answer:
Split 75 into two angles where the values of the six trigonometric functions are known. Apply the sum of angles identity. The exact value of cot(30) is √3 .
Explanation:
