$\frac{dy}{dx}0$
$40+x=25$
$\left(3-2m\right)^2$
$\int arc\:cot\:\sqrt{z}.\sqrt{z}\:dz$
$-2\left(n-9\right)+4$
$\frac{\sec\left(\theta\right)-\cos\left(\theta\right)}{\sin\left(\theta\right)}$
$x^2+9x^2$
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