Questions asked by Daniel F.

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• Why can't sin(3x) be solved using double angle identity?
  
• How to use Double Angle Identity to solve sin(3x)?
  
• A battery takes 2.0MJ to charge. If the charger operates using 40.0 W but it is only 90% efficient, how long does it take to charge?
  
• A hydroelectric power plant produces 1200MW of power at 85% efficiency. A nuclear power plant produces 1200MW of power at 40% efficiency. How much is more power wasted in the nuclear power plant than the hydroelectric power plant?