$\frac{1\cdot sen\left(x\right)-x\cdot cos\left(x\right)}{\left(2x\right)^2}$
$x^2-x=-6$
$3x^2-4x^2+x\cdot x+x^2$
$\left(7a^7b^0\right)\left(8ab\right)$
$\left(3+x^3\right)^2$
$\sin^2\left(\frac{a}{2}\right)-cos\frac{a}{2}=-cos\:a$
$3-2^3-\left(2\:.\:2^3\right)$
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