Solve for C using the form f(x,y)=C. Given [2x + ycos(xy)] dx + x cos(xy)dy = 0; f(1)-pi/6. 1 decimal place for the answer. QUESTION 2 3x(xy-2)dx + (x3 + 2y)dy = 0; f(1)=2 Find the positive root of y at x=2. Use 2 decimal places.