$\frac{d^2}{dx^2}\left(sen\left(x\right)\right)$
$3a^2-\:2ac+\:3f;\:a=2;c=3;\:f=5$
$\frac{d^2}{dx^2}\left(6xy^2\right)$
$y^216x-4x^{2\:}$
$3\ln\left(x-6\right)=9$
$\left(-2x^2y^3z\right)\left(-3xyt\right)$
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