$\int\left(16\tan^{15}\left(x\right)\sec^2\left(x\right)\right)dx$
$a-b-b-a$
$z4+1=0$
$3x-2\:x\:3x-2$
$12ab^2-6^ab^2-24a^6b^2-20ab\:$
$15b^2-10b^3$
$\:\frac{n+4}{n^2.3^n}\:\left(x-2\right)^n$
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