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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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