expansion of log(tanx /x)
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explanation given in picture
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Let y = log tan x
dy/dx = (1/tan x) sec2x
= cos x/sin x cos2 x
= 1/sin x cos x
= 1/sin x cos x
Multiply and divide by 2
= 2/2 sin x cos x
= 2/sin 2x
= 2 cosec 2x
Is the expansion of log (tan x)
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