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Find dy/dx if xcosx=2siny...

Find `dy/dx if xcosx=2siny`

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The correct Answer is:
`{{:(x(costheta-costheta')+y(sintheta-sintheta')-p+p'=0),(and x(costheta+costheta')+y(sintheta+sintheta')-p-p'-a=0):}`
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