$\cos x+\cos y=1$
$\left(3ax\:-\:1\right)^2\:$
$\int csc^25xcot5xdx$
$6x^2y-24xy^3$
$x-0,5=4$
$\int\sin\left(4x-2\right)dx$
$\frac{12x^4+2x^3-x^2-5x-9}{3x^2-x-2}$
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