$\frac{a-b}{\frac{a^2-b^2}{a+b}}$
$y\cdot\ln\left(y\right)+y$
$-4+\left(-2\right)-\left(+3\right)-\left(-5\right)-9+8-\left(-7\right)+3$
$\int cot\:z\:in\:\left(sen\left(z\right)\right)dz$
$\lim_{x\to1}\left(\frac{\left(x^2+4x-5\right)^{\frac{1}{2}}}{\sqrt{x^2-4x+3}}\right)$
$\left(-24+60\right):\left(-12\right)\:\:\:\:\:\:\:\:-12\:.\:\left(-24\right)\:+\:\left(-12\right)\:.\:\left(60\right)$
$25=x+15$
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