$2i-1\left(i^2+i\right)$
$4\cos^2x+3\sin x=1$
$5x.sin\left(x^2-5\right).\cos\left(x^2-5\right)$
$x^{-\frac{2}{3}}+cosx$
$4x^2-100$
$\frac{3x^2+2x+5}{x-3}$
$-3x+7<6$
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