$\left(x^2-4\right)\left(x^2+3\right)$
$45+12x-x^2$
$\frac{x}{2}-4=10$
$2,59\cdot1000$
$\sec^2x-1=\sin^2x\cdot\sec^2x$
$\frac{a^6}{4}+3.a^3.m^2.n+9.m^4.n^2$
$8\left(4\right)\cdot8\left(-2\right)$
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