$\int\cos\left(x\right)\:cos^5\left(sen\:x\right)\:dx$
$\left(7x^2-2\right)\left(7x^2+9\right)$
$y'=-2-y+y^2$
$34-65+89+88-765$
$\frac{cos\left(a-b\right)}{\left(cosa\right)\left(sinb\right)}$
$42a^2-49a$
$3k<27$
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