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If x=a(theta+sin theta) and y=a(1+cos th...

If `x=a(theta+sin theta)` and `y=a(1+cos theta)`, then find the simplified value of `(dy)/(dx)` and show that, `(dy)/(dx)=-1`, when `theta=(pi)/(2)` .

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The correct Answer is:
`-"tan"(theta)/(2)`
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