find dy/dx `x^(2/3)+y^(2/3)=a^(2/3)` at (a,b)

Find the slope of the tangent of the following curve at the given point: x^(2/3)+y^(2/3)=a^(2/3) at (a,b)

Find dy/dx : x^3+y^3=3xy

Find dy/dx : x(y-x)^2=x+y

If x^(2/3) + y^(2/3) = a^(2/3) find (d^2y)/(dx^2) .

Find dy/dx : x^3+y^3+4x^2y-25=0

x(dy)/(dx)-y=x^(2)

Find dy/dx : x = at^2,y = 2at

Find dy/dx : log (xy) = x^2+y^2