$\left(5c-7z\right)\left(4c+3z\right)$
$-730-18$
$\sec x^2-\tan^2x=1$
$2x^2y^z-2xy^2z+2x^2y^2$
$\left(6m\right).\left(m\right)$
$\left(cot\left(t\right)-csc\left(t\right)\right)\left(cot\left(t\right)+csc\left(t\right)\right)$
$6x^2y-9x^3y$
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