13'3 Evaluating Trigonometric Functions

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13.3 Evaluating Trigonometric Functions
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r
(3, 4)
SOLUTION
Use the Pythagorean theorem to find the value of
r.
5
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Using x 3, y 4, and r 5, you can write
the following
(3, 4)
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The values of trigonometric functions of angles
greater than 90 (or less than 0) can be found
using corresponding acuteangles called reference
angles.
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SOLUTION
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Signs of Function Values
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Evaluate tan ( 210).
SOLUTION
The angle 210 is coterminal with 150.
The tangent function is negative in Quadrant
II, so you can write
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SOLUTION
The cosecant function is positive in Quadrant
II, so you can write