$\left(5f^2-3g^2\right)^2$
$4.\left(-5\right).\left(-10\right)$
$\frac{\sqrt[4]{27yx^2n^3}}{6y}$
$6d-4d+9d-3d+7-d$
$\left(7-k\right)^{2}$
$-144x^3xz^2+864x^3y^2y^4-1728x^3y^3z^6$
$2\cos\left(2a\right)^2=1+\cos\left(4a\right)$
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