$2x\cdot6xy$
$a=21,b=14,\beta\:=100^\circ\:$
$7v+6g+4v$
$\frac{12x^5+8x^4+20x^3+16x^2}{4x^2}$
$x^2-5y^2=3$
$\frac{\sec^2x-1}{\sec^2x}\sin^2x$
$\left(\frac{6xy}{z}-3x\right)^2$
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