$( \frac { 1 } { 2 } x - 2 ) ^ { 2 }$
$\frac{5secx}{secx-tanx}=5secx\left(secx+tanx\right)$
$\frac{dy}{dx}=\frac{\left(x+3y\right)}{-\left(x-y\right)}$
$\left(3a-b\right)^3$
$x+3\ge5$
$\frac{dx}{ds}=-\frac{sx}{s^2+1}$
$x'=\left(t+1\right)\left(cos\left(x\right)\right)^2$
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