$4sin^2\left(x\right)+2cos^2\left(x\right)$
$3\left(x-y+5\right)$
$\left(5x^2\right)\left(4x+2\:y\right)$
$\frac{1}{2}x-x$
$\ln\left(\left(4x\right)^{x+9}\right)$
$x^{2\:}+\:6x\:=\:0$
$7x^2+6x$
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