CPM Homework Help : A2C Problem 9-17

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Home > A2C > Chapter 9 > Lesson 9.1.1 > Problem 9-17

9-17.

Without a calculator, find two solutions $0° ≤ θ \lt 360°$ that make each of the following equations true. Compute without a calculator

$\operatorname { cos } \theta = \frac { 1 } { 2 }$
Answer (a):
$60° \text{ and } 300°$

$\operatorname{tan} θ = −1$
Answer (b):
$135° \text{ and } 315°$

$\operatorname { sin } \theta = \frac { \sqrt { 3 } } { 2 }$
Hint (c):
Which quadrants will the angles be in?

$\operatorname { cos } \theta = - \frac { \sqrt { 3 } } { 2 }$
Hint (d):
See part (c).

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