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Mathematics, 28.09.2019 23:30 airiyannag0113

For f(x, y), find all values of x and y such that fx(x, y) = 0 and fy (x, y) = 0
simultaneously. f(x, y) = 15x^3-3xy+15y^3.

my calculations:
fx(x, y)=
45x ^{2} - 3y = 0
fy(x, y)=
 - 3x + 45y ^{2} = 0
i got stuck there

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Answers: 3

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For f(x, y), find all values of x and y such that fx(x, y) = 0 and fy (x, y) = 0
simultaneously...
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