$\int\frac{1}{\sqrt{t^2-6t+13}}dx$
$6^6\:x\:6^{-2}$
$\int\:\frac{12}{1+9x^2}dx$
$\frac{dy}{dx}=\frac{x^2-y^2}{x^2-2xy}$
$4x+3y=11\:$
$\frac{1}{5}\int\frac{1}{\sqrt{x^2+4}}dx$
$-4\cos^2x-\cos x$
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