$\left(2x-3x+1\right)+\left(4x^2-6x-8\right)$
$\int te^{-3t}\:dx$
$9f^2+6f+1$
$18xy+4y^2$
$\int_0^{\infty}k^2\left(e^{-2k\left(x+y\right)}\right)\left(x\cdot y\right)dx$
$y^2-5y<0$
$\left(-5x+x+7x\left(2x\right)\right)$
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