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**Warm Up Evaluate each of the following.**

1) cos (150 ○) 2) sin (360 ○) 3) 4) ) ) 7) tan(240○) ) csc(-225○) 9) cot(20π/3) ) sec(- π/4)

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**Pass up your homework and clear your desk for the QUIZ**

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Homework Answers

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Homework Answers

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**Sum, Difference, and Half Angle Identities**

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**Use your calculator to approximate cos75°.**

Make sure you’re in Degree Mode! Does cos(30°+45°) = cos30° + cos45°?

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**Sum/Difference Identities (You need to MEMORIZE these)**

cos(A + B) = cosA cosB - sinA sinB cos(A - B) = cosA cosB + sinA sinB Examples Calculate: 1. Cos75° Sec75°

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**sin(A + B) = sinA cosB + cosA sinB sin(A - B) = sinA cosB - cosA sinB **

Memorize these sin(A + B) = sinA cosB + cosA sinB sin(A - B) = sinA cosB - cosA sinB Examples Calculate: Sin(7π/12) Csc(7π/12)

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Practice

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Memorize these Example: Calculate

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More Examples

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**Half Angle Identities… (You do not have to memorize these)**

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**Use the half angle identity to evaluate…**

1. tan(π/8) 2. sin(105°)

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