$1+sin^2x=cos^2x$
$( 2 a ^ { 3 } b ^ { 3 } ) ^ { - 4 } ( b ^ { - 1 } a ^ { 8 } ) ^ { 4 }$
$z^3+9z^2+27z+27$
$z^2\sqrt{z^{-4}n^3}$
$\lim_{x\to5}\frac{4x-10}{4x-20}$
$\left(-2a^2+bc^3\right)\left(+2a^2+bc^3\right)$
$\int\frac{6+9x}{1+x^2}dx$
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