Chapter+7

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= Chapter 7 Trigonometric Functions =

Section 7-1
- Measurement of Angles







** Section 7-2 **
- Sectors of Circles

1 radian = 180/π degrees 1 degree = π/180 radians Arc Length Formula s = rØ

**Section 7-3**
- The Sine and Cosine Functions

sinØ = y/r cosØ = x/r

Sine and cosine functions repeat their values every 360° or 2π.



**Section 7-4**
- Evaluating and Graphing Sine and Cosine

//Ask yourself these questions when finding reference angles!// - Is the angle between 0° and 360° / 0 and 2π? - What quadrant is the angle in? - Is sine or cosine positive or negative in that quadrant? - Apply reference angle formula. (pictured below)
 * REFERENCE ANGLES!!!**







**Section 7-5**
- The Other Trigonometric Functions

tanØ = y/x x cannot = 0 cotØ = x/y y cannot = 0 secØ = r/x x cannot = 0 cscØ = r/y y cannot = 0

tan = sin/cos cot = cos/sin sec = 1/cos csc = 1/sin cot = 1/tan







**Section 7-6**
- The Inverse Trigonometric Functions

For every x value, there must be only one y value for the functions to be an inverse. MUST BE ONE TO ONE!