Find the first partial derivatives of f(x,y)=4x6y3+3x4y2+5.
a) fx(x,y)=24x5y3+12x3y2, fy(x,y)=12x6y2+6x4y
b) fx(x,y)=24x5y2+12x3y, fy(x,y)=12x6y3+6x4y2
c) fx(x,y)=24x5y3+12x3y2, fy(x,y)=12x6y2−6x4y
d) fx(x,y)=24x5y2−12x3y, fy(x,y)=12x6y3+6x4y2