$\arccos\left(2.0\right)$
$-4w^2\:-\:3w^2$
$\frac{\cos\:^2\left(x\right)\left(1+\sin\:^2\left(x\right)\right)}{\sin\:^4\left(x\right)}=\csc\:^4\left(x\right)-1$
$\lim_{x\to1}\left(\frac{\left(\sqrt{x}-x^2\right)}{1-\sqrt{x}}\right)$
$\left(a-6\right)^3$
$10-5^0+\left(-3\right)$
$\left(\left(2x-9\right)\right)^2$
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