$\int e^{-5t}cos\left(t\right)dt$
$\left(x+1\right)\left(x+3\right)+\left(x^2+7\right)$
$\int\frac{5x+12}{x\left(x^2+4\right)}dx$
$4^{-1}=\frac{1}{4}$
$\left(2a+3\right)\left(a+5\right)$
$3\left(x^3-2\right)+6x\left(x^2+x\right)$
$\ln\left(9x+7\right)-\ln\left(x\right)=\ln\left(10\right)$
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