$\frac{cos\:t}{sin\:t}+\frac{sin\:t}{1+cos\:t}$
$\int-7e^{-6x-3}dx$
$\left(4a+3x\right)\left(4a-3x\right)$
$\sin\left(2\pi+2x\right)$
$\frac{4a^2b}{a^3b^2}x\frac{5a^2b}{2b^4}$
$\lim_{x\to1}\:\left(x^9-1\right)$
$g\left(x\right)=\frac{\sqrt{x}}{5x^2+4x-1}$
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