设{x=sint y=cos2t,则dy/dx|t=π/4=

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设{x=sinty=cos2t,则dy/dx|t=π/4=设{x=sinty=cos2t,则dy/dx|t=π/4=设{x=sinty=cos2t,则dy/dx|t=π/4=dx/dt=cost=√2

设{x=sint y=cos2t,则dy/dx|t=π/4=
设{x=sint y=cos2t,则dy/dx|t=π/4=

设{x=sint y=cos2t,则dy/dx|t=π/4=
dx/dt=cost=√2/2
dy/dt=-2sin2t=-2
所以dy/dx|t=π/4=dy/dt÷dx/dt=-2√2