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Difference of Squares
(a + b)(a - b)
= 1 - sin
= (1 - sin )(1 + sin )
Likewise: = 1 - cos
= sec + tan
1 - sin
1 - cos
1 + cos
- 1 = sin
ex. 1 - cos = sin
1 + cos
Assignment:
WS Id-Id #13, 14, 19, 20, 39, 43, 44

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  • 1. Difference of Squares (a + b)(a - b) = 1 - sin = (1 - sin )(1 + sin ) Likewise: = 1 - cos = sec + tan 1 - sin
  • 2. 1 - cos 1 + cos - 1 = sin ex. 1 - cos = sin 1 + cos Assignment: WS Id-Id #13, 14, 19, 20, 39, 43, 44