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Turunan berarah fungsi $f$ di titik $(7,24)$ dalam arah $\\mathbf{u}=5\\mathbf{i}+12\\mathbf{j}$ adalah $D_{\\mathbf{u}}f(7,24)=\\var{5*a+12*b}k$ dan dalam arah $\\mathbf{v}=5\\mathbf{i}-12\\mathbf{j}$ adalah $D_{\\mathbf{v}}f(7,24)=\\var{5*a-12*b}k$.

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Di titik tersebut, turunan berarah fungsi $f$ dalam arah $\\mathbf{w}=4\\mathbf{i}+3\\mathbf{j}$ adalah $D_{\\mathbf{w}}f(7,24)=\\dfrac{ak}{65}$ dengan $a=\\ldots$.

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