设y=cos(5x+4)求y'和dy 等于多少
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设y=cos(5x+4)求y'和dy 等于多少
设y=cos(5x+4)求y'和dy 等于多少
设y=cos(5x+4)求y'和dy 等于多少
y'=-5xsin(5x+4) dy=-5xsin(5x+4)dx
y'=-5sin(5x+4)
dy=-5sin(5x+4)dx
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