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Given that \(\displaystyle\int_{-1}^{4} h(x)\,\mathrm d x = 6\) and \(\displaystyle\int_{2}^{4} h(x)\,\mathrm d x = 5\), find the value of \(\displaystyle\int_{-1}^{2} h(x)\,\mathrm d x\).
\(\displaystyle\int_{-1}^{2} h(x)\,\mathrm d x=\)