Trigonometric Sum Identities — Unit test Answers
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21
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Which is equivalent to sin-1(0.75)? Round your answer to the nearest hundredth of a radian.
A
–1.33B
–0.75C
0.68D
0.8522
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What is the value of sin(80°)cos(20°) – cos(80°)sin(20°)?
A
Negative one-half
B
Negative StartFraction StartRoot 3 EndRoot Over 2 EndFraction
C
One-half
D
StartFraction StartRoot 3 EndRoot Over 2 EndFraction
23
Review the proof of .
A
step 2B
step 4C
step 5D
step 824
Which expression is equivalent to 2cos2?
A
0B
1C
1 – 2cos(x)D
1 + 2cos(x)25
Simplify
A
StartFraction 2 sine (x) cosine (x) Over cosine (x) minus sine (x) EndFraction
B
StartFraction 2 sine (x) cosine (x) Over sine (x) minus cosine (x) EndFraction
C
cos(x) + sin(x)D
cos(x) – sin(x)Did you find these answers helpful?
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