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If `y= 1- cos theta`, `x= 1- sin theta`, then `dy/dx` at `theta` = `pi /4` is........ A) -1 B) 1 C) 44198 D) 1/`sqrt 2`

A

-1

B

1

C

44198

D

1/`sqrt 2`

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CHETANA PUBLICATION-Differentiation-Exercise
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