$\lim_{x\to0}\left(\frac{\cos mx-\cos nx}{2x^{2}}\right)$
$\left(9x^2-4\right)\left(9x^2+4\right)$
$11a-8a-2a-3a+5a$
$4x^4-20x^2+12x^3-8x^5$
$\left(x^2+3x+9\right)+\left(y^2-y+1\right)$
$\frac{dx}{dt}=y^n+4y=6sen\left(3x\right)$
$\int\left(x-1\right)\sqrt{2x+5}dx$
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