Use a double-angle identity to find the exact value of the expression.2 cos2 
- 1
A. - 
B. 
C. 
D. - 
Answer: D
Mathematics
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Establish the identity.sin
= 
(sin x - cos x)
What will be an ideal response?
Mathematics
Solve the equation symbolically.29t + 4 = 4t + 14
A. 
B. 
C. 
D. - 
Mathematics
Solve the problem.Of the 481 students at Jorge's school, 259 are native English speakers. What fraction of the students at Jorge's school are native English speakers? Write your answer in lowest terms.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.In how many ways can you answer the questions on an exam that consists of 5 multiple choice questions, each of which has 4 answer choices, followed by 5 true-false questions?
A. 615,873 B. 20,318 C. 157,598 D. 32,768
Mathematics