Find a function f such that F Vf and use it to evaluate f c F dr along the curve C. Here y, z) i cos Y j + = ti+t2j +t4k, 0 ft S 1. k; and C is given by r(t) Evaluate the line integral fc xy2 da; yx2 dy around the triangle with vertices (1, 0), (0, 1), and (0, 0) with clockwise orientation.