The two curves x3 – 3xy2 + 2 = 0 and 3x2y – y3 – 2 = 0 intersect at an angle of

Given the curve x3 – 3xy2 + 2 = 0 and 3x2y – y3 – 2 = 0


x3 – 3xy2 + 2 = 0


Differentiating on both sides with respect to x, we get



Applying the sum rule of differentiation and also the derivative of the constant is 0, so we get



Applying the power rule we get



Now applying the product rule of differentiation, we get








Let this be equal to m1



3x2y – y3 – 2 = 0


Differentiating on both sides with respect to x, we get



Applying the sum rule of differentiation and also the derivative of the constant is 0, so we get



Applying the power rule we get



Now applying the product rule of differentiation, we get







Let this be equal to m2



Multiplying equation (i) and (ii), we get




m1.m2=-1


As the product of the slopes is -1, hence both the given curves are intersecting at right angle i.., they are making angle with each other.


So the correct option is option C

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