$\int8xsec^2\left(x^2-2\right)dx$
$-\frac{1}{2}n^2+18=0$
$6^4\cdot7^4$
$4t+20=4$
$45\cdot82$
$\lim_{x\to0}\:ln\frac{\left(cos\:3x\right)}{2x^2}$
$a^2+8a-16$
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