$( 6 x ^ { 2 } y ^ { 4 } ) ( - 3 x ^ { 4 } y ^ { 4 } )$
$h^2+6h+9$
$\sqrt{63x}-\sqrt{28x}$
$14^{23}.14^8$
$sec^2a+sec^2a\:tan^2a$
$\frac{3x}{2}+\frac{2x}{3}$
$\lim_{x\to\frac{\pi}{2}}\left(2cos\left(-3x\right)sec\left(-7x\right)\right)$
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