$\cos\left(x\right)=\frac{9}{5}$
$2y-3x-x^2=y-x-1$
$\frac{12x^{7}y^{8}}{4x^{3}y}$
$\lim_{x\to0}\left(x^{19x}\right)$
$\int\left(3x^2-x\right)\cos\left(x\right)dx$
$8+500.4$
$25x^2\:+\:kx\:+\:4\:=4$
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