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.
barack hussein obama ii us bÉËrÉËk huËËseÉªn oÊËbÉËmÉ born august 4 1961 is an american politician who is the 44th and current president of the united states he is the first african american to hold the office and the first president born outside the continental united states born in honolulu hawaii obama is a graduate of columbia university and harvard law school where he was president of the harvard law review