Use the Chain Rule to find the indicated partial derivatives. u = (r2+s2)1/2   r = y + x cos(t),    s = x + y sin(t) ∂u ∂x ,   ∂u ∂y ,   ∂u ∂t     when x = 4,  y = 3,  t = 0

Advanced Engineering Mathematics
10th Edition
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Chapter2: Second-order Linear Odes
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Use the Chain Rule to find the indicated partial derivatives.

u = (r2+s2)1/2
  r = y + x cos(t),    s = x + y sin(t)

∂u
∂x
,  
∂u
∂y
,  
∂u
∂t
    when x = 4,  y = 3,  t = 0
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