$\frac{\sin\left(a+b\right)\cdot\sin\left(a-b\right)}{\cos\left(a\right)+\cos\left(b\right)}$
$2-5t+8+5t-8$
$\frac{x^4+x^2-x-2}{x^3-1}$
$\frac{d}{dx}2y+e^{x+y}=x^2-1$
$-10\frac{dy}{dx}=30y+400$
$\frac{b^2}{ab}$
$24a^2b^2-8ab^2$
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