If `x=2 cos t+cos 2t` and `y=2 sin t-sin2t`, then the value of `(dy)/(dx)` at `t=(pi)/(4)` is -

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If `x=2 cos t+cos 2t` and `y=2 sin t-sin2t`, then the value of `(dy)/(dx)` at `t=(pi)/(4)` is -
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