$cos2x=0$
$\lim_{x\to1}\left(3-2x^2\right)^{\frac{1}{1-x^2}}$
$3-2x\cdot2x^2-x+5$
$\left(6+3n\right)\left(4+3n\right)$
$\int\frac{\left(x^3+x+1\right)}{1+x^2}dx$
$x^2+13x+10\:$
$6x^2+6x+15x+15$
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