$13-\frac{\left[7+2-\left(-6\right)\right]}{\left(\frac{35}{-7}\right)}$
$169+26b+b^2$
$2y=xy'$
$\int\left(-3cscxcotx\right)dx$
$\int\left(5x^2-3x\right)sin\left(2x\right)dx$
$50-50\left[3-3\left(4-4\cdot2\right)-5+5\cdot2\right]$
$129=a+57$
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