$\frac{4}{\left(x-2\right)^2\:\left(x+1\right)}$
$\frac{4}{\left(x-1\right)\left(x+1\right)}$
$cos^4x\:csc^2x$
$5-\left(-3\right)+\left(-2\right)+8+4$
$x+\frac{2}{2}$
$2^2+8^2$
$\int_1^{t^2}e^{x^2}dx$
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