y−2xy=0y-2xy=0y−2xy=0
25x2−81y25x − 9y\frac{25x^2-81y^2}{5x\:-\:9y}5x−9y25x2−81y2
(x+4y)(5x−20y)\left(x+4y\right)\left(5x-20y\right)(x+4y)(5x−20y)
(x3+15)(x3−15)\left(x^3+\frac{1}{5}\right)\left(x^3-\frac{1}{5}\right)(x3+51)(x3−51)
x2+3<0x^2+3<0x2+3<0
−6cos2(2x)sin(2x)-6\cos^2\left(2x\right)\sin\left(2x\right)−6cos2(2x)sin(2x)
u(3u+5)=0u\left(3u+5\right)=0u(3u+5)=0
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