Find the derivative of the function. y = cos [(1 − e^7x)/(1 + e^7x)]

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Find the derivative of the function. y = cos [(1 − e^7x)/(1 + e^7x)]

Mathematics
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use the chain rule start with -sin [(1 − e^7x)/(1 + e^7x)] now u need to find derivative of expression in brackets using quotient rule
imo, simplify \[\frac{ 1-e^{7x} }{ 1+e^{7x} }\] first, then take the derivative by using rules.
quotient rule

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Other answers:

\[y=\cos[(1-e^{7x})*(1+e^{7x})^{-1}]\]
whats next?
quotient rule is the last step
help me
|dw:1350240374374:dw|
the derivative of e^7x= e^7x right?
|dw:1350240579605:dw|
okaay
-sin (1 − e^7x)/(1 + e^7x) * [(1+e^7x)(7e^7x)-(1-e^7x)(7e^7x)]/(1+e^7x)^2

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