$\tan y+\cot y=\sec y\cdot\csc y$
$2 \int 5 x ^ { 4 } d x$
$\frac{3w^2+5w-2}{5w^3+4w^2+1}$
$-15t\ge-45$
$8a^2+4a-4$
$\left(2\right)^2+2$
$\lim_{x\to\infty}\left(e^x+2\right)^{\frac{1}{x}}$
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