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Nilai maksimum dari fungsi $f(x,y)=xy^{\\var{a}}$ pada lingkaran $x^2+y^2=\\var{b^2}$ adalah $\\ldots$.

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Petunjuk: Suatu persamaan parametrik untuk lingkaran $x^2+y^2=r^2$ adalah $x(t)=r\\cos(t)$, $y(t)=r\\sin(t)$, $t\\in[0,2\\pi]$.

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