Answers edited by Dharma R.

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• A fence(3m tall) parallel to the wall of a building and 1m from the building.What is the length of the shortest ladder that can be extend from the ground over the fence to the building wall?
  
• Question #68ce1
  
• What is the derivative of #(12/sinx) + (1/cotx)#?
  
• What is the coldest temperature ever recorded in the observant universe until now?
  
• How do you find the equation of the tangent line and normal line to the curve at the given point #y = (1+2x)^2#, (1,9)?
  
• How do you find the value for #cos^ -1 (- sqrt 3/2)#?
  
• How do you find the integral of #((x)sqrt(x-1))dx#?
  
• What is the name of the ionic compound Na3AlF6?