Math Problem Statement
State all angles between 0° and 360° that make each statement true:
a) sin 200° = sin _____
b) tan θ = -2.747, therefore θ = _____ or _____
c) cos 135° = -cos _____ or _____
d) tan (-100°) = tan _____ or _____
Solution
To solve these problems, we need to use trigonometric identities and properties of angles in different quadrants. Let's go through each part systematically.
Problem Analysis and Solutions:
-
State all angles between and that make each statement true:
a)
- To find the other angle with the same sine value, we use the fact that sine is positive in the first and second quadrants and negative in the third and fourth quadrants.
- The reference angle for is .
- So, the other angle with the same sine is .
- Answer: .
b)
- Tangent is negative in the second and fourth quadrants.
- Using the arctangent of , we find the reference angle as .
- The solutions in the given range are:
- (second quadrant).
- (fourth quadrant).
- Answer: or .
c)
- The angle is in the second quadrant, where cosine is negative.
- We want an angle with the same reference angle where cosine is positive.
- The reference angle for is .
- The other angles where cosine has the same magnitude but is positive are:
- and .
- Answer: or .
d)
- To find an equivalent positive angle for , add :
- .
- The other angle with the same tangent value in the given range is:
- .
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Reference Angles
Quadrants
Formulas
sin(θ) = sin(180° - θ) or sin(θ) = sin(360° - θ)
tan(θ) is negative in the 2nd and 4th quadrants
cos(θ) = cos(180° - θ) or cos(θ) = cos(360° - θ)
Theorems
Trigonometric identities for sine, cosine, and tangent in different quadrants
Suitable Grade Level
Grades 10-12