$-25-\left(-45\right)$
$\left(4x^2+3x^5-2-3x^2\right)+\left(3x^2-1-\frac{3}{7}x^2\right)$
$\int_0^3\left(\frac{1}{t^2+9}\right)dx$
$6x^2+48x+36$
$\left(4r+3\right)^2$
$\int\frac{1}{16}x^2\cdot\sin\left(x\right)dx$
$\frac{-x^2}{x^2+1}$
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