$cos35^{\circ}cos25^{\circ}-sin35^{\circ}sin25^{\circ}$
$3x+2<5x-8$
$\lim_{x\to\infty}\left(\frac{2x^2+8}{5x^3+6}\right)$
$16x^2+60x+51\ge0$
$\int\left(2x-2y\right)dy$
$-3+4+2+1$
$-2\left(m+n\right)-5\left(3m+2n\right)$
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