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Select an efficient identity strategy for a given problem
Worksheet
Grade Level
Trigonometry
TRIG.86 Select an efficient identity strategy for a given problem
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To begin verifying cos(x) - cos(y) = -2 sin((x + y) over 2) sin((x - y) over 2), which identity is most efficient first?
A
Use the Pythagorean identity.
B
Use the sum-to-product identity for cos(A) - cos(B).
C
Use the sine double-angle identity.
D
Use the even-odd identities.
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