$b+3b+5b+b+b$
$\int\:\frac{sen\:2\:x\:}{3\:+\:cos2x}.dx$
$-6ab+8ab^2+4a^2b$
$\:4\:cos\:x\:sec\:y$
$784-\left\{5+\left[3-132:-2\right].7\right\}$
$z^{21}-216$
$\left(cos2x-1\right)^2=1$
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