$8\left(-2d+2\right)+7d$
$\frac{-2x^4+6x^3+4x^2+6x+8}{-5+x^2+2x}$
$ax+ay+x+y$
$\int\frac{2x^2+x+4}{x^4+4x^2}dx$
$2\infty2$
$\left(\sin^2\left(x\right)-1\right)\left(\sec^2\left(x\right)-1\right)$
$\int sen\left(4x\right)dx$
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