$\frac{dy}{dx}\left(\tan\left(xy\right)-\sin\left(x-y\right)=x-2y\right)$
$\frac{x^5\cdot x^2}{x^4}$
$\cos2x=0.5$
$\frac{x^{15}+y^{15}}{x^{5}}$
$\frac{\sec x\cdot\cos y}{\tan x}$
$2^2-3$
$11\left(2x-7\right)+2\left(5x-4\right)-3\left(2x-5\right)=-18$
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