$\cot\infty+\frac{1}{\cot\infty}$
$\left(2^a-5y\right)\left(2^a+5y\right)$
$8x^6-6x^54x^4+12x^2+20$
$\frac{y'}{t}=\frac{y}{\sqrt{1-t^2}}$
$5-\left|7-2-\left(1-9\right)-3+12\right|+14$
$-5\left(d+2\right)$
$\left(x^2+3x-5\right)x^2$
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