$\frac{d}{dx}4x+7y=4$
$\left(6.7\right)\:-18\::\:\left(-6\right)$
$\left(4x\:+8\right)\left(4x-9\right)$
$x^2+x^2-x-x$
$3^2+42-1$
$\frac{\left(-1\right)^n\left(\sqrt{3}\right)^{2n+1}}{\left(2n+1\right)}$
$-\tan\left(x\right)^2\:-\sec\left(x\right)^2$
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