$\sin\left(5\right)\cdot\cos\left(3\right)=\tan\left(25\right)$
$-5x-1$
$\left(k+4\right)\left(k-4\right)$
$9x^2-90x$
$\left(x^{a+1}-1x^{a-n}\right)^2$
$-44+4$
$\left|\frac{18-16}{3}\right|$
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