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• What is the derivative of #sin^2 (5x)#?
  
• How do you multiply #(- 2) ^ { - 2} \cdot ( - 2) ^ { - 3} \cdot ( - 2) ^ { 4}#?
  
• 3/10x - 16 = 9/10x + 4 equals what?
  
• How do you evaluate #\frac { 2} { x } - \frac { 5} { 2x + 1}#?