$\left(2s^{\left(2\right)}-s+3\right)$
$hk-hv$
$5cosx=3cosx+\sqrt{3}$
$\left(5x-3y\right)^2=25x^2-30xy+9y^2$
$\left(5p^4+3n^5\right)^3$
$x^2-\left(3y\right)^2$
$\tan^2a-\sec^2a$
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