$15x\:-\:30y\:$
$\left(2x^{0.5}+1\right)\left(2x^{0.5}-1\right)$
$a^2\cdot5a\left(m-1\right)b^x$
$\lim_{x\to0}\left(ln\:8\right)$
$x\left(x^2+x-1\right)-x^2$
$\left(x+x\right)^{\left\{2\right\}}$
$\frac{d}{dx}3x^3+9xy^2=7x^3$
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