$\left(2z-2\right)$
$5d^{2}-24d+9=\left(4d-1\right)^{2}$
$\tan\left(\frac{a}{2}\right)=\csc-\cot$
$x^3-y^3=97$
$3x^2-12x-11=0$
$6xy^3dx\:+\:\left(4y^3+9x^2y^2\right)dy\:=0$
$\left(x+4+2x^2\right)^3$
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