$x^2=72$
$\left(-9y^2+6y-1\right)+3$
$14x=14$
$-121x^6y^6+144x^8y^4$
$( 5 m - 6 n ^ { 2 } ) ^ { 3 }$
$-5\cdot2-16$
$\frac{\tan b}{1+\sec b}-\frac{\tan b}{1-\sec b}$
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