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OpenStudy (m):
y = cost; z = xln(x + 2y) find partial deriv dz/dy is it (2)(x)(1/x + 2y)(-sint)? i'm not sure if 2 belongs in the answer (chain rule).
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myininaya (myininaya):
dz/dy=x*(2y')/(x+2y)=2x(-sint)/(x+2cost)
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