# It looks difficult , but not that difficult

**Calculus**Level 4

*f*(x+y) - (x+y)*f*(x-y) = 4xy(x^{2} - y^{2}) , find the area common to both the curves [*f*(y)]^{\frac{2}{3}} + [*f*(x)]^{\frac{1}{3}} = 0 and [*f*(y)]^{\frac{2}{3}} + [*f*(x)]^{\frac{2}{3}} = 12

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