Let's examine the following graphs: Again, the period of the original sine curve has changed here, as we would expect. The difference with a negative value of b however, is our sine curves have the same period as the positive values of b above, but now they are reflected across the x-axis. For a direct comparison between positive and negative values of b, click here.
Quick Answer. As of 2014, Joachim Gauck is the president of Germany. The 72-year-old was elected to the position on March 18, 2012, in Berlin after receiving 991 of the 1,228 valid votes.
The 45th and current President of the United States is Donald J. Trump. He was sworn in on January 20, 2017. According to Article II of the U.S. Constitution, the President must be a natural-born citizen of the United States, be at least 35 years old, and have been a resident of the United States for 14 years.