$\left(1-2sin^2x\right)csc^2x=4cos^2x-2$
$\frac{2}{cot\:x\:\cdot\:tan\:2x}\:=\:1\:-\:tan^2\:x$
$\left(\frac{2}{3}x+\frac{5}{7}\right)^2$
$4-3b-8$
$x2-2x=0$
$5x^{3y}-15xy^2+25xy$
$3g^2-9v^4$
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