$1\cdot98$
$\int\frac{3x}{\left(x^2+2\right)^2}dx$
$\int2x\cdot\sqrt[3]{x+4}dx$
$\int e^{9x}cos5xdx$
$-10x^2+4x-4x^2-2$
$10x+2\ge20x+5$
$x^{1}-3x^{5}+2x^{2}+5$
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