find ∂w/∂r and ∂w/∂s where r =1 and s = -1 if w=(x + y + z)^2 where x = r - s y = cos (r + s) z = sin (r + s)
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just sub in the expressions for x,y,z. w = [(r-s) + cos(r+s) + sin(r+s)]² if you take ∂w/∂r, then you get ∂w/∂r = 2[1 - sin(r+s) + cos(r+s)][(r-s) + cos(r+s) + sin(r+s)] then just sub in values of r & s. i'm sure you can do it for ∂w/∂s as well.
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