$csc^2+tg^2-sec^2$
$30\cdot6$
$\lim_{x\to0}\left(\frac{7x\ln\left(x\right)-7\left(x-1\right)}{\left(x-1\right)\ln\left(x\right)}\right)$
$3x^3+9xy^2=9x^3$
$\frac{1}{2}x^{2}-\frac{2}{3}xentre\frac{2}{3}x$
$\left(2xy\right)dx+y^2dy-3x^2dy=0$
$\left(+8\right)\cdot\left(+7\right)\cdot\left(-3\right)$
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