$\frac{-\frac{1}{2}}{x^2-x}$
$\lim_{x\to0}\left(\sin\left(\sin\left(x\right)\right)\right)$
$tan^2x=tanx$
$x^2+\left(x+2\right)^2=100$
$\left(x^5+3x^4-7x^3+2x^2+8x-1\right)-\left(x+1\right)$
$f\left(x\right)=x^4-2x\:$
$1.4\cdot2.08$
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