$\left(l+m\right)\left(l-m\right)$
$\text{sen}^2a+3=4-\cos^2a$
$\csc\left(x\right)\:+\:\cot\left(x\right)$
$\left(6x^{7m}-2z^{4n}\right)^2$
$\lim_{x\to0}\left(3x\right)^{\cos\left(x\right)x}$
$64x^3-343$
$6x-3\:\left(3x-3\right)>2\left(2x-30\right)$
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