$\frac{x^4+2}{x^2+6x+3}$
$sec\left(x\right)csc\left(x\right)\left(tan+\cot\left(x\right)\right)=sec^2\left(x\right)csc^2\left(x\right)$
$xy+3y=0$
$\frac{dy}{dx}=\frac{2x-1}{2y-2}$
$y=7^{x^2+2x}$
$-8\cdot125000$
$\frac{d^2}{dx^2}\left(\frac{xy^2}{x+2z}\right)$
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