If x=a(cos t+t sin t) and y=a(sin t-t co...

If `x=a(cos t+t sin t) and y=a(sin t-t cos t)," find "(dy)/(dx) " at " t=(3pi)/(4)`

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The correct Answer is:

the value of `(dy)/(dx) ` at `t=(3pi)/(4)` is -1.

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