$x\sin\left(28\right)=14$
$2x^2-x-x-2x+4$
$\left(4\right)\left(-11\right)\left(-3\right)$
$\lim_{x\to0}\:\left(-8cos\left(2x\right)sen\left(2x\right)+4x\right)$
$143+2\left(5x\right)-5\left(x\right)^2$
$n^2-12n+144$
$a^2-\:4ab\:+\:4b^2\:$
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