$\left(8xy+2x\right)^3$
$\lim_{x\to-0}\left(\frac{\left(8+x\right)^2-64}{x}\right)$
$sen\left(90-x\right)$
$\left(a+b\right)\left(b-a\right);\:a=1;\:b=2\:$
$x^4+3x^2+2$
$\left(45+5-15\right)-\left(-4-12-10\right)-\left(-21+1\right)$
$\left(10-5\right)^2+13$
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