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Perymerdeka · Answer 1 · 2018-05-27T11:53:40+0000

Im assuming that is so

left side = cot x sec^4 x
= cot x (1 + tan^2 x)^2 ( because sec^2 x = 1 + tan^2 x)

= ( 1 + 2 tan^2x + tan^4x)
-------------------------------
tan x

= cot x + 2 tan x + tan^3 x = right side

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