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Day 10 2.4 Sum and Difference Formulas.notebook
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January 03, 2018
Today1) Welcome Back!
2) Quiz Update/Info
3) 2.4a Sum and Difference
Formulas
Day 10 2.4 Sum and Difference Formulas.notebook
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Day 10 2.4 Sum and Difference Formulas.notebook
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Day 10 2.4 Sum and Difference Formulas.notebook
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Question: How do we evaluate a value of something not on the unit circle without a calculator?
Example: sin π12
Answer: Using Sum and Difference Formulas!
Day 10 2.4 Sum and Difference Formulas.notebook
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Sum & Difference:
Double‐Angle:
Half‐Angle:
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Example 1: Find the exact value of the sin π12
sin π12π12
π12
π12
π12
Which values w/a denominator of 12 are on the unit circle?
unit circle?
π12
π12
π12
π12
π12
π12
π12
Which values add to (or subtract to) ? π12
Day 10 2.4 Sum and Difference Formulas.notebook
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Day 10 2.4 Sum and Difference Formulas.notebook
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Evaluate the exact values of sine, cosine and tangent of 5π12
Example 2
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Find the exact value of sin (x + y) given sinx = 4/5 where 0 < x < π/2 and cos y = 12/13 where π/2 < y < π
Example 3
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Example 4
Find the exact value of the cos 75o
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HW: Pg. 239 # 1113, 19, 20, 41, 42, 47, 48
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