Question: Find dw/dr when r = 1, s = -1, if w = (x + y + z)^2 x = r-s, y = cos(r+s) and z

Find dw/dr when r = 1, s = -1, if w = (x + y + z)^2

x = r-s, y = cos(r+s) and z = sin(r+s)

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