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4 . Consider the line integral _ C F dr where C is the quarter circle r ( t ) = cos ( t )

4.
Consider the line integral _C F dr where C is the quarter circle r(t)= cos(t)i + sin(t)j,0 t
/2 and F = j (a constant field).
1. Compute this integral by the Fundamental Theorem, finding first a function f such that
F =f .
2. Since F is conservative, in computing _C F dr the curve C may be replaced by any other
path with the same initial and end points.
Find a path that goes from (1,0) to the origin and then to (0,1) for which the line integral
of F is obviously equal to one.

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