Express the function as a trigonometric function of x.cos 4x
A. cos3x - 3 sin2x cos x
B. 3 sin x - 4 sin3x
C. cos4x - 6 sin2x cos2x + sin4x
D. 4 sin x cos3x - 4 sin3x cos x
Answer: C
Mathematics
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Graph the inequality.
? 1
A. 
B. 
C. 
D. 
Mathematics
Use symbols to name the figure. If more than one symbol is possible, give all possible names.
S?L
A. 
B. 
or 
C. 
or 
D. 
Mathematics
Perform the indicated operation. Simplify if possible.
+ 
A. - 
B. 
C. 
D. - 
Mathematics
Give the answer to the question. Let k be a natural number. ? Is ( - 5 ) 2k + 1 positive or negative? ?
A. positive B. undefinable number C. negative
Mathematics