$\left(a+3b\right)^4-22\left(a+3b\right)^2+121$
$\lim_{x\to\frac{1}{2}}\left(\frac{cos^2\pi x}{e^{2x}-2ex}\right)$
$\left(+50\right)+\left(-45\right)-\left(214\right)$
$6x+21x$
$\frac { 12 x ^ { 5 } y ^ { 7 } } { 4 x ^ { 6 } y ^ { 3 } }$
$2cos\left(x\right)=\sqrt{2}$
$\left(-30\right)-311-\left(-418\right)$
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