Graph the expression on each side of the equals symbol to determine whether the equation might be an identity.
= -2tan2 x
A. Not an Identity
B. Identity
Answer: A
Mathematics
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Find the exact value of the trigonometric function.cos 
A. - 
B. - 
C. 
D. 
Mathematics
Find the actual difference.0.25 - (-7.468)
A. 1.867 B. 7.818 C. 7.718 D. 7.218
Mathematics
Solve the system of equations using matrices (row operations). If the system has no solution, say that it is inconsistent.
A. x = 6, y = 8, z = 7; (6, 8, 7) B. x = -6, y = 7, z = 12; (-6, 7, 12) C. x = 6, y = 7, z = 8; (6, 7, 8) D. inconsistent
Mathematics
If 
, find 
.
?
A. 
B. 
C. 
D. 
E. 
Mathematics