$\lim_{x\to-2}\left(2x^3-16\right)$
$-1+2+\left(-15\right)+6+\left(-10\right)+7+3+\left(-8\right)$
$16a^4-9b^2$
$\lim_{x\to1}\frac{1-x}{\left(cos^{\frac{\pi}{2}}\right)\left(sen^{\frac{\pi}{2}}\right)}$
$5cos^2x+3sin^2x=3-2cos^2x$
$725-303+18$
$m^2+4m+49$
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