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Usaha yang diperlukan untuk memindahkan objek pada lintasan \$$C: r(t)=t^2\\,\\mathbf{i}+\\sin t \\,\\mathbf{j}+t\\,\\mathbf{k}\$$ untuk \$$0\\leq t\\leq \\pi\$$ jika terdapat medan vektor \$$\\mathbf{F}(x,y,z)=y^2\\cos(z)\\, \\mathbf{i}+2xy\\cos(z)\\, \\mathbf{j}-xy^2\\sin(z)\\, \\mathbf{k} \$$ adalah $\\ldots$.

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