Multiply.
? 31
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Use periodic properties of the trigonometric functions to find the exact value of the expression.tan 13?
A. 1 B. undefined C. -1 D. 0
Mathematics
Find the phase shift of the function.y = -5 cos (2x + ?)
A. 
units to the left
B. 
units to the left
C. 2? units to the right
D. 5? units to the right
Mathematics
For problems 4-15, perform the indicated operations and simplify.
A. 
B. 
C. 
D. 
E. none of these
Mathematics
Two linearly independent solutions of the differential equation 
are
Select the correct answer.
?
A. 
, 
B. 
,
C. 
,
D. 
,
E. 
,
Mathematics