What is the purpose of using double angle identities in this video?

Trigonometric Functions and Identities

Interactive Video
•
Mathematics
•
9th - 12th Grade
•
Hard

Ethan Morris
FREE Resource
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9 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To find the derivative of functions
To calculate integrals
To solve quadratic equations
To simplify and evaluate trigonometric expressions
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of simplifying cosine squared A minus sine squared A?
Cosine of 2A
Sine of 2A
Secant of 2A
Tangent of 2A
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If A equals pi/12, what is cosine of 2A?
Secant of pi/6
Tangent of pi/6
Sine of pi/6
Cosine of pi/6
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the cosine of a 30-degree angle?
1/2
Square root of 3 divided by 2
Square root of 2 divided by 2
1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which identity is used for the second expression involving 2 cosine of pi/4 times cosine pi/4?
Secant of 2A
Sine of 2A
Cosine of 2A
Tangent of 2A
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the value of sine of pi/2?
Square root of 2 divided by 2
1
0
-1
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the simplified form of 2 cosine squared pi/2 minus 1?
Sine of pi
Secant of pi
Cosine of pi
Tangent of pi
8.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the cosine of pi?
-1
1
0
Square root of 2 divided by 2
9.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you verify the cosine of pi on the unit circle?
By checking the x-coordinate
By checking the y-coordinate
By checking the radius
By checking the angle
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