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Turunan berarah dari fungsi $f(x,y)=cos(2x)sin(3y)$ di titik $(\\frac{\\pi}{3},\\frac{\\pi}{4})$ dalam arah $60^{o}$ terhadap sumbu-$x$ positif dapat dinyatakan dalam bentuk $-\\frac{A}{B}\\sqrt{6}$, di mana $A$ dan $B$ adalah bilangan bulat positif dengan $\\frac{A}{B}$ dalam bentuk paling sederhana. Nilai dari $A+B$ adalah

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