$3\cdot1+7$
$3\left(x+1\right)-2\left(x-1\right)$
$2x+3x^3-5x^4-8x^2$
$18f^2+12f+2=2$
$2x+3x^2-x^3$
$1-\sin x=\frac{\cos2x}{1+\sin x}$
$\lim_{x\to0}\left(x^{2.9}ln\left(x\right)\right)$
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