limh→0(2cos(2π3+h)−2cos(2π3)h)\lim_{h\to0}\left(\frac{2cos\left(\frac{2\pi}{3}+h\right)-2cos\left(\frac{2\pi}{3}\right)}{h}\right)h→0lim(h2cos(32π+h)−2cos(32π))
2516x2+209xy+6481y2\frac{25}{16}x^2+\frac{20}{9}xy+\frac{64}{81}y^21625x2+920xy+8164y2
x2−2x+x−2+3xy−6yx^2-2x+x-2+3xy-6yx2−2x+x−2+3xy−6y
227x5−3486x5−2135x52\sqrt{27x^5}-3\sqrt{486x^5}-2\sqrt{135x^5}227x5−3486x5−2135x5
axbxaxbxaxbx
25x2−50x+2525x^2-50x+2525x2−50x+25
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