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Section 6.3 Properties of the Trigonometric Functions

Section 6.3 Properties of the Trigonometric Functions. 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.

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Section 6.3 Properties of the Trigonometric Functions

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  1. Section 6.3 Properties of the Trigonometric Functions

  2. 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.

  3. P(x,2) θ r = 5

  4. Since θ is in quadrant II, x values are negative

  5. θ P(-1,-3)

  6. Since sin θ < 0, csc θ is negative.

  7. Find the exact value of: • cos (60°) (b) sin (390°) (c) tan

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