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14-08-2017
Mathematics

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cot x sec^4x = cot x + 2 tan x + tan^3x

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Аноним Аноним

14-08-2017

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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