$\int\frac{1}{x^2\sqrt{121-x^2}}dx$
$\frac{dy}{dx}=\frac{x^2+2xy-y^2}{x^2-2xy-y^2}$
$5^{2x}+5^x=0$
$13a+20b-19+18b-26a$
$\frac{x^4-2x^3-2x^2-3}{-x^2-2x+1}$
$cos2x=2+4sinx$
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