$11a+11a$
$\int\:\:cos\left(x\right)sec^2\left(sen\left(x\right)\right)\:dx$
$\left(3b\right)^2+2\left(3b\right)\left(7\right)+\left(7\right)^2$
$\int\sqrt{\tan\left(3\right)+4}dx$
$x^4-x^2-20$
$t^2+7t+7$
$11=d-u-9$
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