$f\left(x\right)=\frac{1}{1-x^3}$
$5a^2+a^2+2a^2$
$\lim_{x\to-1}\:\left(2x^2+6x-1\right)$
$\int_0^{\infty}\left(sinx\left(x\right)e^{-x}\right)dx$
$7\tan^2\left(x\right)-21\tan\left(x\right)=0$
$12a\:+\:20b$
$x^5+3x^4-15x^3-35x^2+54x+72$
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