$y'+3\left(tan3x\right)y=3cos3x$
$4x-18x$
$5x^2-5x-30$
$+12-6+8-\left(-3\right)-5+9-\left(-7\right)+8$
$\pi\sen\pixd$
$49x^4+1-14x^2$
$f\left(x\right)=\sqrt{x^2}+1\:-\ln\left(\frac{\sqrt{x^2+1}}{2x}\right)$
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