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sin(a + b) & cos(a + b) - Discovery

Author:
Tim Brzezinski
Topic:
Angles, Triangles, Trigonometric Functions
Directions are given in the applet below.
Use your results to write 2 new trigonometric identities from what you now see. After doing so, go to the following applet: http://tube.geogebra.org/m/1651617

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