$80\cdot54$
$4\int\sec^3x\:dx$
$\int sen^3\left(bx\right)\cos\left(bx\right)dx$
$3a-\left(8a+3\right)$
$\frac{1}{2}+\frac{2}{3}\cdot\left(-\frac{4}{5}\right)\:-1,3\infty$
$3\:a^2\:b^3-\:40\:d;\:a=1\:;b=2;\:d=\frac{1}{2}$
$5 - \{ ( 8 - 6 : 3 ) + 4 ( 5 \cdot - 3 + 5 ) - 7 \}$
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