$x^2+6x+15>0$
$\int\frac{x^2+4}{x^2-4x+4}\:dx$
$10=7-m$
$\lim_{x\to0}\left(\left(x-1\right)e^{-.2x}\right)$
$12x^3y-30x^2y^2-42x^3y^4$
$\int\frac{e^{4t}+2e^{2t}-e^t}{e^{2t}+1}dt$
$\sqrt[4]{x^4y^2z^2}$
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