$\left(2+3\left(a+b\right)\right)^2$
$\left(a\:+\:b\right)^4$
$\cos\left(z\right)+\tan\left(z\right)\sin\left(z\right)$
$tan^2x+4\sqrt{3}=7$
$1+2-5-6$
$\lim_{x\to0}\left(e^x-3x\right)$
$( a ^ { 3 } + 7 ) ( a ^ { 3 } - 6 )$
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