$\sec\left(x\right)=7$
$x\frac{dy}{dx}+y=-4x$
$43+\left|1+\left(-59\right)\right|$
$8a^2+8ab+2b$
$-\left(4a^2\:+2mx\right)-\left(-5mx-2a^2\right)\:$
$2cos2y=1$
$\left(2x+4\right)\left(2x-7\right)+\left(3x-1\right)^2$
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