$-88\:.\:-1$
$\left(42\right).\left(-23\right)$
$\frac{tan\:x-\:senx}{tanx}$
$\int\frac{x^2-4x-+7}{x^3-x^2+x+3}dx$
$2\left(3x-4y+7\right)$
$\left(8x^4y^5\right)^0$
$yln\left(x\right)-xy'=0$
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