$\left(5a^2-1\right)\left(5a^2+1\right)$
$\left(\frac{3x^2}{4y^4}\right)^3$
$\frac{1}{ts^2+s}$
$\left(7-1v\right)^2$
$\left(3\cdot5x\right)^3$
$15x-4x+6x-11x$
$\cot\left(x-y\right)=\frac{1}{\tan\left(x-y\right)}$
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