y= sinx
y'=cosx
y'(2π/3) = cos(2π/3) = -1/2
切线方程 (2π/3, √3/2)
y-√3/2 =y'(2π/3) .(x-2π/3)
y-√3/2 =-(1/2)(x-2π/3)
-2y+√3=x-2π/3
x+2y -2π/3-√3 =0
法线方程 (2π/3, √3/2)
y-√3/2 =-[1/y'(2π/3)] .(x-2π/3)
y-√3/2 =2(x-2π/3)
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