ch.7 Trigonometry in Circles and Triangles

# ch.7 Trigonometry in Circles and Triangles - Chapter 7...

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Chapter 7 Trigonometry in Circles and Triangles 7.3 Graphs of the sine and Cosine

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Key Points Graphing y = Asin(t) and y = Acos(t) Graphing y = sin(t) + k and y = cos(t) + k Amplitude, period, and midline
Using Angles to Measure Position On a Circle Conventions For Working With Angles • We measure angles with respect to the horizontal, not the vertical, so that 0 describes the 3 o’clock position. • Positive angles are measured in the counter- clockwise direction, negative angles in the clockwise direction. • Large angles (greater than 360 or less than −360 ) wrap around a circle more than once. Functions Modeling Change: A Preparation for Calculus, 4th

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x y The Sine and Cosine Functions Suppose P = (x, y) in the figure is the point on the unit circle specified by the angle θ. We define the functions, cosine of θ, or cos θ, and sine of θ, or sin θ, by cos θ = x and sin θ = y . In other words, cos θ is
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ch.7 Trigonometry in Circles and Triangles - Chapter 7...

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