$y''-y'+14y=0$
$\frac{1-\sin^2\frac{1}{4}\pi}{\cos\left(\frac{1}{4}\pi\right)}$
$15f^c-15f^2+20f$
$\left(2k+4\right)$
$3a^2+3a^2+6ab^2$
$2y^3-8x^2y$
$g\left(t\right)=\sqrt{\frac{1}{t^2-2}}$
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