$\left(3mn^2\right)^2.\left(2x^2\right)^{-1}$
$7-10-5+4+6-1$
$\lim_{x\to\infty}\left(\frac{\sqrt{x^5+1}}{x^2+1}\right)$
$\frac{\left(\sin\:\left(2x\right)\cos\:^2\left(x\right)-2\sin\:^2\left(x\right)\cos\:\left(x\right)\right)}{\sin\left(2x\right)}=\cos\left(2x\right)$
$-330-300-200-170-270-10+80$
$3\cos^2\left(a\right)+5\cos\left(a\right)=2$
$\frac{xy}{2\:\:}\:\:y\left(1\right)=1$
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