$x^6-729y^6$
$x^2.x^2-3x^2+3x^2-3.-3$
$\int_{0}^{2}z^{3}\sqrt{z^{2}+4}dz$
$\frac{7x}{x^2}$
$\int\left(1-cscy\right)^2dy$
$\frac{8\cdot1^{\frac{7}{4}}-5\cdot1^{\frac{4}{5}}-3}{1^2-1}$
$\frac{3x}{x^{2}-25}+\frac{15}{x^{2}-25}$
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