$\left(h-6\right)\left(h+6\right)=0$
$\left(1-x\right)e^{-x}$
$1+\cot^2a$
$\left(7a^{-2}+5\right)\left(7a^{-2}-5\right)$
$\left(-24\right)\cdot\left(-7\right)$
$x^2-9x-10=30$
$2^2-1^2$
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