此函数的n阶导数,
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此函数的n阶导数,
此函数的n阶导数,
此函数的n阶导数,
y' = -2cosxsinx = -sin2x,
y" = -2cos2x = -2sin[2x+1*(π/2)],
y"' = -(2^2)cos[2x+1*(π/2)] = -(2^2)sin[2x+2*(π/2)],
……(可用归纳法)
y^(n) = -[2^(n-1)]sin[2x+(n-1)*(π/2)].