$\frac{d^2y}{dx^2}+4=0$
$\left(2k+1\right)^2$
$3a+3a$
$\sec x^2-\tan^2x=1$
$\frac{d}{dx}\frac{-14-2xy^2}{2x^2y}$
$4^3\cdot4^8\cdot4^7$
$\int\sec^2\left(15x\right)dx$
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