$5x^2-3y;x=1;y=-2$
$\frac{1}{4}a-\frac{3}{5}a+a$
$9\cdot10^7$
$\lim_{x\to\infty}\frac{x-2}{x+1}$
$2-2\sin\left(x\right)$
$\cot^2\left(x\right)=\csc\left(x\right)+5$
$-1548-259$
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