Sum and Difference Identities

Flashcard
•
Mathematics
•
12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What are the Sum and Difference Identities for sine?
Back
sin(a ± b) = sin(a)cos(b) ± cos(a)sin(b)
2.
FLASHCARD QUESTION
Front
What are the Sum and Difference Identities for cosine?
Back
cos(a ± b) = cos(a)cos(b) ∓ sin(a)sin(b)
3.
FLASHCARD QUESTION
Front
What are the Sum and Difference Identities for tangent?
Back
tan(a ± b) = (tan(a) ± tan(b)) / (1 ∓ tan(a)tan(b))
4.
FLASHCARD QUESTION
Front
Find the exact value of cos(20)cos(40) - sin(20)sin(40).
Back
1/2
5.
FLASHCARD QUESTION
Front
Write cos(175)cos(55) + sin(175)sin(55) as a single trigonometric function.
Back
cos(120)
6.
FLASHCARD QUESTION
Front
What is the value of sin(90°)?
Back
1
7.
FLASHCARD QUESTION
Front
What is the value of cos(0°)?
Back
1
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