$\frac{dy}{dx}=\frac{x}{2}-\frac{2}{x}$
$\sqrt{a-7}=a$
$2x\cdot e^{4x}+x^2\cdot e^{4x}\cdot4$
$y25=y-11$
$\frac{2x^2+9x-5}{6x^2-5x+1}$
$x^2-5x+6+x+6$
$\cos\left(x\right)\sin\left(x+y\right)-\sin\left(x\right)\cos\left(x+y\right)$
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