$\cot\left(x\right)^4\cdot\csc\left(x\right)^2-\cot\left(x\right)^2\cdot\csc\left(x\right)^2+\csc\left(x\right)^2-1$
$-2+1+2$
$3\left(2-5\right)+1$
$\lim_{x\to\infty}\left(\frac{8^x-6}{e^x+5}\right)$
$x^4+x^2y^2-3xy^3$
$5x\left(2+10m\right)$
$sin\left(163\right)\cdot\:\:sin\left(223\right)+sin\left(253\right)\cdot\:\:sin\left(313\right)$
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