
Double Angle and Half Angle Formula
Presentation
•
Mathematics
•
11th Grade
•
Hard
Joseph Anderson
FREE Resource
3 Slides • 14 Questions
1
Review Double & Half Angle Identities
2
3
Multiple Choice
(sinu)(cosu)
2(sinu)(cosu)
(sinu)^2
2(sinu)^2
4
Multiple Choice
cos θ = 4/5 and 270° < θ < 360°
Find sin 2θ
-1/5
24/25
-24/25
-25/24
5
Multiple Choice
sin (2θ)
1. sin θ= 3/5 , 0<θ<π/2
24/7
7/25
24/25
1/2
6
Multiple Choice
120/169
25/169
60/169
5/13
7
Multiple Choice
sin2(25) - cos2(25)
cos2(50) - sin2(50)
cos2(25) - sin2(25)
sin2(50) - cos2(50)
8
Multiple Choice
2cos2 (40) - 1
2cos2 (20) - 1
2cos2 (20) + 1
2cos2 (40) + 1
9
10
Multiple Choice
sin θ = −3/5 and 3π/2 < θ < 2π Find tan θ/2
-1/3
-√3
√3/3
-1
11
Multiple Choice
sin 22.5º
√(2 + √3)/2
√(2 - √2)/2
√(2 + √2)/2
√(2 - √3)/2
12
Multiple Choice
If cosA=31 , then the positive value of tan 2A ?
2
3
33
22
13
Multiple Choice
If cosθ=81, the positive value of sin 2θ is
23
47
169
43
14
Multiple Choice
The expression 2sin30ocos30o has the same value as
sin15o
cos60o
sin60o
cos15o
15
Multiple Choice
If cosθ=81, what is the value of sin 2θ if 23π<θ<2π
23
−47
169
−43
16
Multiple Choice
Use a double angle identity to find the exact value of sin420°
−1
0
21
23
17
Poll
After this review, I feel ------------ about using double & half angle identities
very confident
confident/OK
shaky...I'm so-so
not so sure...I'm very confused
Other: my thoughts/feelings are not expressed here
Review Double & Half Angle Identities
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