Express the sum or difference as a product of sines and/or cosines.cos(6?) + cos(4?)
A. 2 cos(5?)
B. 2 sin(5?) sin ?
C. 2 cos(5?) sin ?
D. 2 cos(5?) cos ?
Answer: D
Mathematics
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Evaluate the expression.
- 
A. - 
B. - 
C. 
D. 0
Mathematics
Write with rational exponents and then apply the properties of exponents. Assume that all radicands represent positive real numbers. Give answers in exponential form.
? 
A. x9/7 B. x29/12 C. x12/14 D. x14/12
Mathematics
Find the exact value of the expression. Do not use a calculator.1 + sin2 80° + sin2 10°
A. 1 B. 0 C. -1 D. 2
Mathematics
Add or subtract as indicated. Then simplify your answer if possible. Leave the answer in terms of sin ? and/or cos ?.
?
?
A. 
B. ?
C. ?
D. ?
E. ?
Mathematics