In the beginning remind the definition of sine and cosine functions.[br]A point E on unit circle have coordinates ([color=#0000ff]_________[/color], [color=#ff0000]__________[/color]) where [math]\alpha[/math] is an angle defined by that point.
Let t be an arbitrary real number.[br]T=E(t) corresponds to it on the number circle. The cosine value is ______________ coordinate, and the sine value is ___________________ for the point T = E(t). [br](select true answer)[br]