$\:\frac{\left(2t+1\right)}{2\left(t^2+t\right)}$
$\int\frac{-9x^3}{\sqrt{x^2+9}}dx$
$232.22-122.4$
$43-19-\left(-34\right)$
$sin3u\:=\:sin\:u\:\left(3\:-\:4sin^2u\right)$
$-6-\left(-5\right)+1$
$\int2\cot\left(x\right)-3\sin^2\left(x\right)dx$
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