$49x^4+14x^2y+y^2$
$\int\cosh\left(x\right)\cosh\left(2x\right)\:dx$
$2x<5x+2\:$
$\frac{x^5+1}{x^2-1}-x^3-x$
$\frac{dy}{dx}+2e^xy=e^x$
$\frac{8x^3+48x^2+96+64}{2x+4}$
$f\left(x\right)=6x^3-4x\cdot3x+x^4$
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