$\lim_{x\to1}\left(\frac{x}{\sqrt{1-x^2}}\right)$
$3m^2a+\left(5a-5m^2a\right)-7m^2a$
$\frac{d^3}{dx^3}e^{3x}$
$x^4-4x^3+8x$
$y^4=-\frac{6}{x^{-4}}$
$\frac{1-cos2x}{cos^2x}=\frac{2}{cot^2x}$
$\lim_{x\to7}\left(\frac{3-\sqrt{x}}{x-7}\right)$
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