$\int t\:cos\left(20t\right)\cdot e^{\left(-st\right)}dt$
$-12303-111$
$\int_{0\:\:}^{\infty\:}cos\left(3.14x\right)dx$
$-0,25-3,6$
$\int\left(\frac{secx^2}{tan^2x+15tanx+56}\right)dx$
$\frac { 2 } { 3 } + \frac { 1 } { 3 }$
$\frac{-x^4-4x^3+6x^2-7}{x^2-2}$
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