$\left(a+b\right)^2-\left(a+b\right)\left(a-b\right)-\left[a\left(2b-2\right)-\left(b^2-2a\right)\right]$
$2-6x<18+5x$
$\left(x^2y+xy^2\right)^2$
$8-2-4+6-3+5$
$y^2=576$
$\frac{\tan\:\left(a\right)}{\sec\:\left(a\right)}$
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