1. Properties of the Trigonometric Functions
Section 6.3
Properties of the Trigonometric Functions
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15. Therefore, this angle must lie in quadrant II.
If sin  > 0 and cos  < 0, name the quadrant in which the angle  lies.
For sin  > 0 the y value must be positive so the angle must be in quadrant I or II.
For cos  < 0 the x value must be negative so the angle must be in quadrant II or III.
Therefore, this angle must lie in quadrant II.
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24. θ
P(x,2)
r = 5
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25. Since θ is in quadrant II, x values are negative

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27. P(-1,-3) θ
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28. Since sin θ < 0, csc θ is negative.
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31. Find the exact value of: cos (60°) (b) sin (390°) (c) tan
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