$\left(gf-4\right)\left(gf+4\right)$
$\left(4^2+\:3\right)-3^0$
$\frac{a^{-5}}{a^3}$
$36x^2-18xy4+4y$
$\sqrt{12x^3}y^2z^4$
$sin^2x+\cot\left(x\right)\cos\left(x\right)\sin\left(x\right)$
$6xy^3-9xn^2y^3-3n^2x^4y^3$
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