$2\cdot4-4\cdot6-4$
$-7+2a>9$
$\int_1^3\left(x^3-2x\right).\ln\left(x+1\right)dx$
$-3x^7+6x^5+9x^2+3x$
$\left(x+6\right)\cdot3$
$\left(\csc x\:+\:\cot x\right)\left(\csc x\:-\:\cot x\right)\:=\:1$
$-5x+5+9x-1$
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