$41w+2w+47+24-8$
$\frac{1}{1+\tan^2x}+\frac{1}{1+\cos^2x}=1$
$2x^2+x-4=0$
$\lim_{x\to\infty\:}\left(2x^2e^{-x}\right)$
$\int\frac{1}{x^4\sqrt{16-x^2}}dx$
$3x^{-\frac{5}{3}}$
$\frac{x^2-7x+10}{x^2-9x+20}$
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