Calculus/Calc I


PAUL KLARREICH wrote at 2013-01-17 04:00:52
Try this sneaky trick: (implicit differentiation)

y =sqrt (e^tanx)

y^2 = exp(tan x)

2 ln y = tan x

2 y'

---- = sec^2 x


y' = sec^2 x y/2

y' = sec^2 x sqrt(exp(tan x)) / 2


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Frederick Koh


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