This section was initially really hard to learn. The sum and difference IDs could be really tricky. However, by the time the test came around I really understood the material. I liked that it went with the unit circle because unit circle makes sense to me. Graphing was a little difficult though.
3. sin2x= 2sinxcosx
2(12/13)(5/13)
120/169
5. x= -348.32 and -16.32 and 11.68 and 191.68
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