$\frac{x^7}{x^2}$
$8x^4-xy^3$
$\left(3-2i\right)\left(1+3i\right)$
$\int\left(2x^2-x\right)\cdot e^{2x}dx$
$\left(1+\tan^2x\right)\cos^2x=1$
$2a+4b-6+3a$
$\frac{7^8}{7^9}\cdot7^2$
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