Answers edited by Bryson

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• Solve #lim_(x->0) (2tanx)/(xsecx)#?
  
• Related rates problem?
  
• How do you find the derivative of #f(x)= x+ sqrtx #?
  
• How do you differentiate #g(x) = sqrt(x-3)e^(4x)cos(7x)# using the product rule?