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यदि (cosx)^(y) = (cos y)^(x) हो , तो सिद...

यदि `(cosx)^(y) = (cos y)^(x)` हो , तो सिद्ध कीजिए की -
`(dy)/(dx) = (log(cosy) + ytan x)/(xtan y + log(cosx)).`

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