【Algebra 2/Precalc】Trig Basic Functions 04

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trig angle sum/diff identities; review and going "backwards"
;wow!
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Review Batch Problems
4:48 problem 01 -> 12:03
12:26 problem 02 -> 15:02
15:35 problem 03 (route A) -> 21:16 (i forgot the - sign)
21:54 problem 03 (route B) -> 24:46 (correct)
27:27 problem 03 (route A fixed) -> 30:29
31:04 problem 04 -> 35:56
36:37 problem 05 -> 39:37
40:00 problem 06 -> 42:45
43:20 problem 07 -> 50:58
51:43 problem 08 -> 53:27
53:48 problem 09 -> 55:49
56:30 problem 10 -> 1:02:58
New Type Problem
1:03:31 problem 11 -> 1:08:12
1:09:19 problem 12 -> 1:12:42
1:14:41 problem 13 -> 1:17:35
1:18:32 problem 14 -> 1:21:41
Going "Backwards" (Condensation)
1:22:25 concept
1:24:11 problem 15 -> 1:27:27
1:28:34 problem 16 -> 1:30:23
1:31:19 problem 17 -> 1:33:41
1:34:39 problem 18 -> 1:36:15
1:37:52-1:45:40 (please skip)
1:45:41 problem 19 -> 1:51:02

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