x (sin(x)cos(y))=cos(y)cos(x)
 
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x (sin(x)cos(y))=cos(y)cos(x)
  • steps
  • x (sin(x)cos(y))

  • Treat y as a constant

  • Take the constant out:    (a·f)=a·f
    =cos(y) x (sin(x))

  • Apply the common derivative:     x (sin(x))=cos(x)
    =cos(y)cos(x)

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