$x^2-9x+\left(\frac{9}{2}\right)^2$
$0.02\cdot5$
$20a^2-45$
$\tan\left(x\right)+\cot\left(x\right)=\sec\left(x\right)-\cos\left(x\right)$
$4.5-8$
$\left(1-b\right)^4$
$\left(n-9\right)\left(n-4\right)$
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