Answers edited by Calculus V.

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• What is the slope of a horizontal tangent line?
  
• How do you find the derivative of #w=(2-3x)/(1+2x)#?
  
• Differentiate in the form of wrtx? sin^3xsin3x
  
• How do you test this series? sum for n=1 to infinity sin^2(1/n) convergence , by using limit comparison test with cn=1/n^2 .