$\frac{dy}{dx}+0.25y=0$
$\int\frac{ax+b}{\sqrt{c^2-x^2}}dx$
$x^2-18x+209=2x+11$
$\left(x^2-x-6\right)+\left(x^2+x-20\right)+26$
$2\:\sec\csc a=\:\sec a$
$3\cos^2+\sin^2=3$
$\lim_{x\to0}\left(\frac{e^x}{\left(senx\right)^2-x^2}\right)$
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