xdxdv=1−4v23vx\frac{dx}{dv}=\frac{1-4v^2}{3v}xdvdx=3v1−4v2
213213\frac{2^{13}}{2^{13}}213213
1cos a=cosa1−sin2a\frac{1}{cos\:a}=\frac{\cos a}{1-sin^2a}cosa1=1−sin2acosa
67.518\frac{67.5}{18}1867.5
−11+8+n-11+8+n−11+8+n
(x3−4x+3x2):(x−3)\left(x^3-4x+3x^2\right):\left(x-3\right)(x3−4x+3x2):(x−3)
7x+2=−687x+2=-687x+2=−68
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