Rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1.cos3(7x + 2)
A. 
cos(7x + 2)cos(14x + 4)
B. 
cos(7x + 2)[1 + cos(7x + 2)]
C. 2 cos(7x + 2)[1 - cos(14x + 4)]
D. 
cos(7x + 2)[1 + cos(14x + 4)]
Answer: D
Mathematics
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A. 3i B. -3 C. 3 D. -3i
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Find the key numbers of the expression.
?
?
A. 0, 
B. 0, 49
C. 0, 51
D. 0, -49
E. 0, 
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