$1910-580$
$a^2x\cdot a^2x$
$\cos x^2=2$
$5\:+\:\left[5\:-\:\left(4\:-\:9\right)\right]\:\cdot\:1\:\cdot\left[5\:+\:\left(3\:\cdot\:2\:+\:1\right)\right]$
$\lim_{x\to-1}\frac{x^2+8x+7}{x^2+x}$
$55+2x<17x-29$
$2x^2-7x-9=x^2-4x-5$
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