$\lim_{x\to0}\left(1+4x\right)^{\left(-\frac{2}{x}\right)}$
$\frac{\sec^2\left(a\right)-1}{\sec\left(a\right)}$
$3\left(a\:-\:b\right)\:+\:2\left(c\:-\:d\right)\:-\:3\left(a\:-\:b\:+\:2c\right)$
$-2>2x+5$
$-6k^2x^3+5k^3x^2-9k^2x^3$
$\left(x+9\right)\left(x-7\right)$
$y^{\prime}=e^{x}$
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