$\frac{csca-sena}{cota}=cosa$
$1^2+2^1$
$-x^3+2x^2+9x-18$
$-4\cdot\left(-19\right)\cdot\left(-15\right)$
$\:8m^3\:-\:27y^6$
$-233\:+\:989$
$\frac{64-x^26}{4-x^22}$
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