$xy\:+y+x+1$
$\left(1+\tan\left(a\right)\right)\left(1-\tan\left(a\right)\right)$
$-y^4\:+\:20y^3\:-132y^2\:+369y\:-378$
$\frac{\sin\left(x\right)\cdot\cos\left(x\right)}{\cos\left(2x\right)}-\frac{\tan\left(x\right)}{1-\tan^2\left(x\right)}=0$
$\int t^7\sin\left(2t^4\right)dt$
$\left(a^2+1\right)\left(a^3+2\right)$
$\frac{dy}{dx}-2y=4$
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