$\frac{dy}{dx}=\left(4x+6\right)\cos\left(y\right)$
$x^2-x+9$
$-3a^5b^3.7a^4\:b^{11}$
$-\left(-10\right)+\left(-10\right)$
$+2+7-10$
$\frac{2x^2-10x+2}{\left(x-3\right)\left(5-x\right)}$
$\left(3x+4x^3-8+9xy\right)^2$
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