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Find the value of (dy)/(dx) at theta= pi...

Find the value of `(dy)/(dx)` at `theta= pi/4`, if `x=ae^theta(sintheta-cos theta) and y=ae^theta(sin theta+cos theta).`

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OSWAAL PUBLICATION-CONTINUITY AND DIFFERENTIABILITY-DIFFERENTIABILITY ( LONG ANSWER TYPE QUESTIONS-I)
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