$\cot\left(x\right)x\sec\left(x\right)$
$\sqrt[2]{x}+5=18$
$42.5\cdot0.2$
$sen\:\left(x+b\right)$
$a^{in}\cdot a^{in}$
$\left(5x+3\right)\left(2x-1\right)$
$4^1\cdot\left(7+5\right)^0$
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