高数微分问题,x = 1 + t^2 y = cos t d^2y / d^2x = ( )

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高数微分问题,x=1+t^2y=costd^2y/d^2x=()高数微分问题,x=1+t^2y=costd^2y/d^2x=()高数微分问题,x=1+t^2y=costd^2y/d^2x=()dy/d

高数微分问题,x = 1 + t^2 y = cos t d^2y / d^2x = ( )
高数微分问题,x = 1 + t^2 y = cos t d^2y / d^2x = ( )

高数微分问题,x = 1 + t^2 y = cos t d^2y / d^2x = ( )
dy/dx=dy/dt/dx/dt=-sint/2t,d^2y/dx^2=(dy/dx)/dt/dx/dt=(-2tcost+2sint)/8t^3