1.

यदि ` (cos x)^(y)` =(sin y) ^(x) , ` तो `(dy)/(dx) ` का मान ज्ञात कीजिए|

Answer» दिया है `" " (cosx )^(y) =(sin y)^x`
` rArr " "ylog cos x = x log sin y`
` rArr y(-sin x)/(cos x ) +log cosx *(dy)/(dx) =x*(1) (siny)cos y* (dy)/(dx)`
` " "+ log sin y*1 `
` rArr " "-y tan x+log cos x (dy)/(dx) =x*cot y(dy)/(dx) +log sin y`
` rArr " "(dy)/(dx) (log cos x -x cot y) =log sin y+y tan x `
` therefore " "(dy)/(dx) =(log sin y+ y tan x )/(log xcos x -x cot y ) `


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