$\frac{dy}{dx}=cos\left(x+y\right)+sen\left(x\right)sen\left(y\right)$
$x^4+9x^2+14$
$2x^3-7x^2-x+6$
$6x-5y=30$
$-\frac{9}{6.66}$
$\sqrt{\left(a-b\right)\left(a^2-b^2\right)}$
$\frac{2}{x+3}-\frac{2}{a+3}$
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