$\int-2x^3sin\left(3x\right)dx$
$\frac{4.1\:\:-4}{\left(4.1\right)^2-3\left(4.1\right)-4}$
$2x^2-7x-9=x^2-4x-5$
$\int\frac{\sqrt[2]{ln\left(\sqrt{x}\right)}}{x}dx$
$sin\left(x-\frac{5\pi}{6}\right)$
$\int_0^{20}\left(\frac{3}{\sqrt{400-x^2}}\right)dx$
$-36-8+3-7\left(-2\right)$
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