$3cos\left(a\right)-1=0,\:0^{\circ}\:360^{\circ}$
$\lim_{t\to-1}\left(1-2t\right)$
$3\lim_{x\to\frac{\pi}{2}}\left(\frac{-\cos\left(x\right)}{\frac{\cos\left(x\right)}{\sin\left(x\right)}}\right)$
$\left(-10abc\right)\left(25ab\right)+\left(25ac\right)\left(-10abc\right)$
$x\sqrt{1+y^2}dx-y\sqrt{1+x^2}dy$
$5m^2-4m^2+20m^2$
$\frac{x^6y^2z^5}{x^{-3}y^{-9}z^2}$
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