Solve the equation.x4 - 13x2 - 48 = 0
A. {- 
, 
, -4i, 4i}
B. {4, i
}
C. {-4, 4, -i
, i
}
D. {-16, 3}
Answer: C
Mathematics
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A. 
+ 
+ 
B. 
- 
C. 
+ 
- 
D. 
+ 
- 
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Find all solutions of the equation in the interval [0, 2?).cos2 x - 1 = 0
A. 
, 
B. 0, ?
C. 
D. 0
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A. 294 B. 19 C. 34 D. 95
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