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Unformatted text preview: than 1. x HalfAngle Formulas Example 1 Find sin 105 . Use 105 = 210 . 2 g Example 5 1 5 Find the cos . Use . 8 2 4 Example Find the sin 75 using the sin formula. 2 x Example Find the cos 105 using the cos formula. 2 x Example 5 1 5 Find the tan . Use . 8 2 4 Example Find the tan 105 using the tan formula. 2 x (a) (b) (c) (d) If tan =1 and lies in quadrant II, find cos 2 . 1 1 undefined(a) (b) (c) (d) 7 If the tan = ,find the tan . 24 2 7 48 7 12 3 4 1 7...
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 Fall '11
 jayjohn
 Cos, Expression

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