$\left(1-\sin^{2}x\right)\csc^{2}x=\cot^{2}x$
$\left(-11\right)\left(-1\right)$
$x^2+9\ge0$
$\frac{x^3+3x^2+3}{x-2}$
$\frac{3x+6}{2}$
$\left|91\right|-71$
$\int\ln\left(3x^5\right)dx$
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