limx→0(tan(5x)tan(8x))\lim_{x\to0}\left(\frac{\tan\left(5x\right)}{\tan\left(8x\right)}\right)x→0lim(tan(8x)tan(5x))
tan(x+2)+1=y\tan\left(x+2\right)+1=ytan(x+2)+1=y
r =cos20∘ + cos100∘ + cos140∘r\:=cos20^{\circ}\:+\:cos100^{\circ}\:+\:cos140^{\circ}r=cos20∘+cos100∘+cos140∘
−cos2((2π 18))-\cos^2\left(\left(2\pi\:\frac{1}{8}\right)\right)−cos2((2π81))
3x2−3x−12=6x2−6x−183x^2-3x-12=6x^2-6x-183x2−3x−12=6x2−6x−18
a2+ ab a^2+\:ab\:a2+ab
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