$a^2-b^2=36$
$+5-7+\left(-8\right)\left(+7\right)$
$2x-5y\:=\:10\:$
$\left(1+1\right)\cdot2$
$1y+1y+1y+1y$
$-5\left(\cot^2\right)x-\csc^2$
$\left(5x+2\right)^2-\:\left(5x-2y\right)^2$
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