$30\:-\:\left(-45\right)$
$400-58$
$\left(-1240\right)\left(-3\right)\left(1\right)$
$25x^2\:+\:30x\:+\:9\:=\:0$
$\frac{5x^2-3x-2}{x^2-1}$
$y=\left(2x\right)^{\sin\left(x\right)}$
$\lim_{x\to\infty}\left(\frac{sinx\:\cdot\:x}{x^3+2x^2-x+1}\right)$
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