These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
Seven Reasons Why Russia Wants to Keep Ukraine All to Itself. MOSCOW, RUSSIA - DECEMBER 17: Russian President Vladimir Putin (R) and President of Ukraine Viktor Yanukovych attend a Russian-Ukrainian Summit on December 17, 2013 in Moscow, Russia.