$\frac{\left(\left(-1\right)^nx^n\right)}{11^n\left(n^2+2\right)}$
$x^2y'+2xy\:=3x^2\:$
$sec\left(x\right)=1.236$
$\left(-1\right)+5-15-1+\left(-1\right)$
$\int_0^{\infty}\left(\frac{1-\cos\left(x\right)}{x^4}\right)dx$
$-38d^2e^6f+25d^2e^6f$
$\lim_{x\to2}\frac{\left(x^2+8\right)}{x^4-16}$
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