5.4 Sum and Difference Identities for Sine and Tangent



Sine of a Sum or Difference



Tangent of a Sum or Difference




Find the exact value of each expression










Write each function as an expression involving functions of θ.














Finding Function Values and the Quadrant of A + B


Suppose that A and B are angles in standard position, with


Find each of the following:


a) b)










c) the quadrant of A B


Verifying An Identity using Sum and Difference Identities


Verify that the equation is an identity.