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\mathrm{f}(\mathrm{x})=\sin ^{5}(\mathrm{x}) \cdot \mathrm{f}^{\prime \prime} (\mathrm{x})=5\left\{-\sin ^{5}(\mathrm{x})+4 \sin ^{3}(\mathrm{x}) \cdot \cos ^{2}(\mathrm{x})\right\}