$\frac{d}{dx}x^2-3y^2+7=0$
$-\left(\left(-2\right)\right)-\left(\left(+7\right)\right)$
$\lim_{x\to0}\left(x^{-2}ln\left(1-x\right)\right)$
$x=y^2-2$
$\int\frac{\sqrt{4+2x}}{x}dx$
$11x^2y^3\:15x^2^3$
$25+5y\ge8$
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