$\left(2x^4y^3+3x^3y^2+5xy\right)\cdot\left(3x^2y-xy\right)$
$-5\left(x^4+2x^2+15\right)$
$\frac{\left(sin\left(-x\right)\right)}{\left(cos\left(-x\right)\right)}$
$\frac{6x^3-3x^2+2x-5}{3x-3}$
$-4a-3a$
$\left(\cos\left(x\right)+\sqrt{2}\right)\left(2sinx-1\right)=0$
$\lim_{t\to1}\left(t^2-x^2\right)$
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