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# 7.3 More on Trig Functions - PowerPoint PPT Presentation

7.3 More on Trig Functions. Example 1 . Determine exact values of trig functions of angle that terminates in QIV and. 8. . -15. 17. Q IV. Q IV tells us its (–). Example 1 . 8. . -15. 17. Q IV. Ex 2) Write in terms of the same trig function of the related angle. 261 .

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### 7.3 More on Trig Functions

Determine exact values of trig functions of angle that terminates in QIV and

8

-15

17

Q IV

Q IV tells us its (–)

8

-15

17

Q IV

261

21830 – 180

261 – 180

= 81

= 3830

QIII so sin is (–)

QIV so cos is (+)

QII so tan is (–)

(Not y-axis)

Ref  always to x-axis

Summary of 7.3 related angle

60

SOH CAH TOA

30

Summary of 7.3 related angle

POSITIVE

45

y

90

(0, 1)

Sin

All

x

Tan

Cos

0

180

(-1, 0)

(1, 0)

(0, -1)

270

Homework related angle

#708 Pg. 407 2, 4, 20, 21, 26,

27 – 39 odd, 42, 43, 46, 49,

51 – 57 odd, 61, 65, 70, 74