$x^2-x-3$
$-3m\frac{1}{2}n$
$5x+6\left(x-4\right)+8x-9-3\left(x+4\right)$
$\left(sen\left(x\right)+cos\left(x\right)\right)^2-2\cdot sen\left(x\right)\cdot cos\left(2x\right)$
$\left(-2\right).\left(-4\right)-\left(-3\right).\left(-4\right)$
$\lim_{x\to2}10$
$2\sin\left(x\right)\cos\left(x\right)=\frac{\sqrt{3}}{2}$
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