$\frac{1}{sin\:x-1}-\frac{1}{sin\:x+1}=-2sec^2x$
$\left(4x^2-x-6\right)^2$
$2\left(x\:-\:3\right)\:-\:3\left(x\:-\:1\right)\:<\:8\:$
$m^2-10m+2m$
$\frac{6x^3y^2z+6xy^3z^2-9x^2y^4z^3}{-3x^2yz}$
$-2x+3y=14$
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