$\lim_{x\to2}-\left(\frac{|x|-2}{x-2}\right)$
$\int - 3 x ^ { 7 } d x$
$3\cdot11b+9b$
$sen\:x\:cos\:x\cdot\left(tan\:x+\:cot\:x\right)=1$
$\left(3x^2+6x^3+1-7x\right)-\left(-2^2+3x+2x^3-5\right)$
$2ax2+6ax-20a$
$-30\:\cdot\:-56$
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