$-8+1+-9$
$2x^{-2}-7x^{-1}-15=0$
$\int_0^x\left(e^{-x^2}\right)dx$
$a.a.b$
$-91-1$
$x^2y^3\cdot x^5y^2$
$\cos\left(6\right)^2$
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