$x^2-28x+4$
$sen\left(8x\:-\:40^{\circ}\right)csc\left(3x+60^{\circ}\right)\:=\:1$
$h^2-12h$
$\left(-15\right)+\left(-42\right)-\left(-15\right)+\left(+14\right)-\left(+26\right)$
$rewrite$
$\frac{x+1}{x-2}=\frac{3}{x^2-x-2}-2$
$12\left(-1\right)-1$
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