$1-\sin^2$
$20\cdot\left(-20\right)$
$-14mn+11mn-9mn-6$
$17a+2-2a-3$
$4\log x-3\log y$
$4\sin x\cos^3x-\cos x\sin^3x=\sin4x$
$\left(3b^4\right)^{-1}$
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