$8\sqrt{7}-\:10\sqrt{7}+9\sqrt{7}$
$\lim_{x\to+0}\frac{ln\left(tan2x\right)}{ln\left(tan3x\right)}$
$y'=3y-y^2$
$\int\sqrt{7}dz$
$x^2-4+4$
$\log\left(x+3\right)-1=\log\left(x+5\right)$
$\left(5x+1^{12}\right)$
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