$\lim_{x\to0}\left(\frac{e^x-e^{-x}-2x}{\sin\left(x\right)}\right)$
$a+a+3b+b$
$1+tan^2x=secx$
$\frac{dy}{dx}y=-18$
$\left(x^2+2x+1\right)\left(x^2-2x-1\right)$
$\frac{-3x^3+4x^4+2x-1}{x+2}$
$98.51\cdot1000$
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