$tan^2\theta\:-sin^2\theta\:=tan^2\theta\:\:sin^2\theta\:$
$25m^2-81$
$y'=ky$
$\left(a+b\right)\cdot c\cdot d,\:a=2,\:b=4,\:c=3,\:d\:=-25$
$9x^2-24x=3$
$\left(x^2-3\right)\cdot\left(x^2-2x+4\right)$
$12.4\cdot6.2$
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