Differentiate tan inverse 1+cosx/sinx frrom
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Dy/dx=. tan^-1(1+cosx/sinx)...
tan^-1(cotx/2)
tan^-1[tan(π/2-x/2)]
dy/dx(π/2-x/2)
1/2...............
tan^-1(cotx/2)
tan^-1[tan(π/2-x/2)]
dy/dx(π/2-x/2)
1/2...............
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