$\frac{-60x-36}{5x+3}$
$\frac{dy}{dx}+\frac{4}{x^2-1}\cdot y=0$
$4\cos^2\left(x\right)\cdot\cos\left(x\right)$
$\left(72x^5-18x^4-45x^2\right)+\left(-9x^2\right)$
$\frac{1}{3}x+\frac{1}{2}y=7$
$\cos\left(\frac{\pi}{2}-x\right)=\sin\left(w\right)$
$97\cdot21^0$
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