Simplifying
$21\cdot9$
$\left(5.4+3.25\right)\cdot8+3$
$-5\left(16\right)\left(4\right)$
$2x+1\cdot2x-1$
$b^2+12ab+36ba^2$
$cot^2xtan^2x+cot^2x=csc^2x$
$\int\left(10\cdot\csc^2\left(5x\right)\left(\cot\left(5x\right)\right)\right)dx$
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