$\lim_{x\to0}\left(\frac{2\tan^23x+\cos^24x-1}{5x^2}\right)$
$4r^4\:\left(-3r^3\right)$
$\:x^2-5x-14=0$
$\frac{\left(3x^2\right)}{\left(1+5x\right)^2}$
$50x^3y-72xy^3$
$\frac{126}{-63}$
$\int\left(6x+1\right)^4\left(2x\right)dx$
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