$\lim_{x\to0}\left(\frac{3e^x-e^{-a}-2}{a}\right)$
$2\cdot6+4\cdot4+8\cdot2$
$00a^{2}-140ab+49b^{2}$
$\sqrt{x+12}=x$
$\frac{d}{dx}x^2y^2=81$
$2a^2-\frac{3}{2}a^2b;\:a=2;\:b=5$
$x=75-y^2$
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