$-21x^2+11x-2$
$x+6\left(y+3\right)-\left(3y-x\right)$
$-6x^2-x+1=0$
$1.38x^2-1.83x$
$csc^2x=cotx+1$
$3cos\:u\:sin7u$
$\left(6x+y^2\right)^3$
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