$\left(5m^2-\sqrt{7}\right)\left(5m^2+\sqrt{7}\right)$
$\tan\left(a\right)+\cot\left(a\right)\cdot\sin\left(a\right)\cdot\cos\left(a\right)$
$\frac{d}{dx}x\sqrt{1+2y}+y-x^2=0$
$72\:x\:+28$
$\lim_{x\to\infty}\frac{e^x}{x-1}$
$\lim_{x\to0}\frac{5x^2}{\sqrt{\left(1+x^2\right)}-\cos\left(3x\right)}$
$4\sin\left(2x\right)+3=1$
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