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4 cards from this section. Quick, good the night before a test.
What are the coordinates for θ = 0° on the unit circle?
Think about where the first point on the unit circle is.
Is sin(90°) positive or negative?
Consider the y-coordinate at 90°.
What is cos(π/2)?
Look at the coordinate at 90 degrees.
Is sin(−30°) equal to −sin(30°)?
Think about how sine behaves with negative angles.
Prove that the sine and cosine functions repeat every 360° by using the unit circle.
Visualize drawing the circle with additional 360°.
If θ is in the second quadrant and sin(θ) = 3/5, find cos(θ) and explain its sign.
Recall the identity sin²θ + cos²θ = 1.
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