`(x + y)^3 = x^3 + y^3, (-1,1)` Find `dy/dx` by implicit differentiation and evaluate the derivative at the given point.
Differentiating both sides with respect to x,
Derivative at point (-1,1) can be found by plugging in the values of (x,y) in dy/dx.
Therefore derivative at point (-1,1)=`(-1^2-2(-1)(1))/(1^2+2(-1)(1))`
`Derivative = -1`