help pls, will upvote

3. (25pts) Answer the following questions on line integrals. (a) (10pts) Consider the vector field F = (ary + xeby + 1)i + (x2+2 - 3x2eby)j, where a and b are constants chosen so that F is conservative. Find the values a, b and evaluate So F . dr, where C is the curve x(t) = cos'(t), y(t) = sin' (t), 0