$\lim_{x\to0}\left(\frac{x^2+2x-3}{x^2-1}\right)$
$3w+2w=7w$
$\frac{cosx}{1+sinx}-\frac{\cos\left(x\right)}{1-\sin\left(x\right)}=2secx$
$5\left(\infty\right)^3+7\left(\infty\right)$
$195-36+30$
$\left(-4\right)^2-4.\left(1\right)\left(1\right)$
$\sqrt{3x}+5$
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