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Find dy/dx if ax+by^2=cosy...

Find `dy/dx if ax+by^2=cosy`

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`ax + by^(2) = cos y `
Differentiate both sides w.r.t. x
`a + 2 by (dy)/(dx)= - sin y (dy)/(dx)`
`rArr (2by + sin y) (dy)/(dx) = - a rArr (dy)/(dx) = (-a)/(2by + sin y) `
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