$16a^2+4a+4$
$\left(a^2+ab\right)\left(-2ab+b^2\right)$
$10-\left(-2+\left(-3-4-1\right)+1-\left(-4-2\cdot3-1\right)-4\right)$
$\sin\left(\sec^{-1}\left(x\right)-\tan^{-1}\left(y\right)\right)$
$\sin\left(-t\right)=-\:\sin t$
$\left(2y^2-9\right)^2$
$\left(\sqrt{7x^4-3}\right)^2$
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