Find the derivative of y.y = sech (-3?) (1 - ln sech(-3?))
A. sech (-3?) tanh (-3?) ln sech (-3?)
B. -3 sech (-3?) tanh (-3?) ln sech (-3?)
C. -3 sech (-3?) tanh (-3?) ln (-3?)
D. 1 + 3 sech (-3?) tanh (-3?) ln sech (-3?)
Answer: B
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A. 18
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C. 
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B. 
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, 
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B. - 
C. 
D. 
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