$\frac{tan\left(x\right)+cot\left(x\right)}{sin\left(x\right)+cot\left(x\right)\cdot cos\left(x\right)}$
$a\cdot a$
$\lim_{x\to2}\left(sen\left(x\right)cos\left(x\right)\right)$
$a^3b-a^2b^2+ab^3-b^5$
$2x^2+14x=1$
$5\cdot0-6$
$\frac{10a^{x-2}}{5a^{x+6}}$
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