4(8n+2)4\left(8n+2\right)4(8n+2)
3.545⋅2.443.545\cdot2.443.545⋅2.44
x2−15x=450x^2-15x=450x2−15x=450
limx→0(tan2x−2sinxx3)\lim_{x\to0}\left(\frac{tan2x-2sinx}{x^3}\right)x→0lim(x3tan2x−2sinx)
sin(90+x)=cos(x)\sin\left(90+x\right)=\cos\left(x\right)sin(90+x)=cos(x)
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