Question

if y=tanh 2x, proof dy/dx = 2(1-y^2)

Answer 1

\[y= \tanh2x\]\[dy/dx= 2sech ^{2}2x\]
im not sure about my next step

Answer 2

do you remember the identity of hyperbolic functions?

Answer 3

relating to tanh n sech ?

Answer 4

ohhh... yeah

Answer 5

thanks

Answer 6

did you get the answer?

Answer 7

yup, i totally forgot about the identities