If tan x=tan y,then tan x-tan y=0

or sin x.cos y-cos x.sin y =0

cos x.cos y

which gives sin(x-y)=0 WHY?

Given, tan x = tan y

⇒ tan x - tan y = 0

⇒ sin (x-y) = 0  [using: sin (a-b) =  ]

Hope you get it!!

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