Eileen, Jackie, and Kathryn needed to find the difference between two angles A1 and A2, that they had drawn on a diagram:
B = A1+A2
They then had to find the cosine of B. Jackie measured A1 to be 50° and A2 to be 3°. But their pencil was kind of dull, so the lines they had drawn were about 0.5° thick. How much uncertainty in each angle was caused by the thick pencil lines? How much uncertainty is there in B? How about the cosine of B?
I found b(max) = 48 and b(min) to be 46 and the uncertainty to be 47+/- 1 but I don't know how to find cosine of B. Also is my answer for uncertainty correct?