$y-4y+6y-y$
$\lim_{x\to0}\left(\frac{secx+1}{tanx-1}\right)$
$25x^2+15x+4x^2$
$3-4x=19$
$3n^3.n^2.-3n^3$
$\frac { 9 a ^ { 5 } } { 2 a ^ { 3 } }$
$4+-13+-8$
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