$-1x\cdot2\:-1x\:-1.x-3$
$cot^4xcsc^2x$
$ax+yb+ab+yx$
$\int\:\frac{4x}{\left(x^2+1\right)\left(x^2+2x+3\right)}dx$
$421\cdot23$
$42x+130x+25$
$7xy2z-2xy2z+xy2z-6xy2z$
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