$\int4e^{-5x}+\frac{5}{x}dx$
$\frac{d}{dx}\sqrt{x+\sqrt{x+\sqrt{x}}}$
$\lim_{x\to7}\left(\frac{x^2-4x-21}{35-5x}\right)$
$4a^4+8a^2a^2+9b^4$
$\frac{2x^2-2}{3x^2+6x+3}$
$-5\:x^2\:y.\left(-4\:x^3y^2\right)$
$\frac{1+\tan\:^2\left(30\right)}{\sec^2\left(30\right)}=1$
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