Valuate the line integral Integral from Upper C to font size decreased by 10 gradient phi times d Bold r for the following function phi and oriented curve C (a) using a parametric description of C and evaluating the integral directly, and (b) using the Fundamental Theorem for line integrals. phi(x, y)equalsxy; C: r(t)equalsleft angle cosine t comma sine t right angle, for 0less than or equalstless than or equalsStartFraction pi Over 4 EndFraction (a) Set up the integral used to evaluate the line integral using a parametric description of C. Use increasing limits of integration. Integral from nothing to nothing (nothing )dt (Type exact answers.)