Question: Please do fast n 2 1) Recall that sech(x) = extex Let f(x, y) = 2sech (x - 4y). Find the second order partial derivatives:

Please do fast n

2 1) Recall that sech(x) = extex Let f(x, y) = 2sech (x - 4y). Find the second order partial derivatives: 22 f a) 2x2 a2f b ) ayax [Hint: You may find that the algebra simplifies somewhat if you let tanh ( x) = ex - ex d Then sech(x) = -sech(x) tanh(x) and ex tex dx dx tanh(x) = sech (x).]

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