$\int\arctan\left(t\right)dt$
$x^2+1=\ln5xy$
$\int\frac{x^3}{x^4-4}dx$
$\left(-924\right)-\left(49\right)$
$a=5,b=6$
$-1\cdot13+12$
$8\cos\left(2\alpha\right)=8\cos\left(\alpha\right)-1$
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