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



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v.s
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sin (1 − e^7x)/(1 + e^7x) * [(1+e^7x)(7e^7x)(1e^7x)(7e^7x)]/(1+e^7x)^2

v.s
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help me!!

zepdrix
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dw:1350242642176:dw
Hmm I think you have your derivatives backwards on the top and bottom.

zepdrix
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Oh nevermind, yours looks good.. I think you're just missing a minus sign on the first term :)

v.s
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yeaa

v.s
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thanks