$4\left(k+9\right)$
$2cos2y=1$
$8\sqrt{3}\cdot\frac{\sqrt{3}}{2}$
$\sqrt[6]{\frac{1}{m^2}}\cdot\:\sqrt{\frac{1}{m}}$
$\frac{dy}{dx}=\frac{4x-1}{2y+6}$
$\frac{x^4-5x^2+4}{x+5}$
$\sin=-0.8$
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