$a=\left(x+1\right)\left(x-1\right)$
$25y+12y-31y-8y+5y$
$\int_0^{\pi}sec\:x\:dx$
$\int\frac{x^3+2x-1}{\left(x^2-4x+8\right)^3}dx$
$\left(2x+3x^2-4y\right)-\left(-4x^2\right)$
$\frac{d}{dx}\left(3xy^5-2x^5y=0\right)$
$\frac{7}{sin\left(x\right)}+x$
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